Mandevilla is a gorgeous tropical vine that thrives outside until night temperatures dip to 45-50 F. (7-10 C.), at which time it’s time to think about overwintering mandevilla.

There are two options to mandevilla winter care: allow the plant to go dormant or bring the plant inside to continue to grow. Mandevilla care indoors does require more attention than allowing the plant to go dormant. When indoors, the mandevilla vine light requirements need to be specifically addressed. Read on to learn how to care for your mandevilla through the winter months.

About Mandevilla

Native to Brazil, mandevilla is noteworthy for its dark green, glossy leaves, vining habit and stunning trumpet shaped blooms. It can be grown outside in USDA zones 9-11 and can then be transferred inside for the winter.

Outdoors mandevilla loves light although, depending upon temperatures for your area, it often prefers bright indirect light. A mandevilla also requires soil that is well draining and, unlike many other tropical plants, does not like to be pot bound. During the active growing phase, fertilize your mandevilla once a week with a liquid fertilizer.

Dormant Mandevilla Winter Care

The first option when overwintering mandevilla is to allow the plant to go dormant. In this case, keep the vine outside until temperatures dip below 60 F (16 C), then spray off with water or insecticidal soap to remove any pests. Hard prune the vine to about 12 inches (30 cm).

Store the pruned vine in a cool, dark area like a garage, crawlspace, or basement with temperatures around 50-60 F (10-16 C). Do not fertilize or water except to keep the soil barely damp throughout the winter.

In early spring bring the vine into a sunny area inside. Pinch new shoots occasionally to foster a bushier habit. In late May to early June, repot and fertilize with a water soluble food. Return outside when all danger of frost has passed and temperatures are above 60 F (16 C).

Mandevilla Care Indoors

As temperatures cool outside, begin to acclimate the plant to a move indoors. The amount of light the plant gets indoors is likely less (unless you provide supplemental lighting) so to get the vine used to less light, move it into a shaded area a week or so before its move indoors.

If you have a greenhouse, sunroom or other bright sunny window inside, move the mandevilla inside as soon as the weather cools. As above, prune back the mandevilla -- by half or even more. The goal here isn’t to encourage growth but to simply keep the vine alive and healthy until the spring. As such there is no need to fertilize, and water should be applied only when the soil begins to dry out (about once a week).

If the plant is not provided supplemental lighting, mandevilla will grow slowly will likely not bloom. In fact, it isn’t unusual for the plant to become dormant.

In February, prune the plant back again and begin to fertilize once a month. Since mandevilla flowers on new growth, pruning and feeding will encourage early blooming. Place the plant outside in May or June for the summer.

Mandevilla Light Requirements

If you wish to encourage growth on an indoor mandevilla, it will need supplemental light. Outdoors, mandevilla thrives in bright -- albeit indirect -- sun. You will need to mimic this light indoors if you wish to obtain growth or blooms.

A sign that you should provide additional light is plants that become leggy. Even a sunroom doesn’t have the same amount of natural light as outdoors. You may wish to use supplemental fluorescent, incandescent bulbs or grow lights.

Mandevilla is a reliable flowering vine with big, leathery leaves and stunning, trumpet-shaped blooms. However, the vine is frost sensitive and suitable for growing outdoors only in the warm climates of USDA plant hardiness zones 9 through 11. In cooler climates, it is grown as an indoor plant.

Like all potted plants, occasional repotting is necessary to keep the plant healthy and to provide ample growing space for the roots. Fortunately, repotting mandevilla isn’t difficult. Read on to learn how to repot mandevilla in a new pot.

When to Repot a Mandevilla

Mandevilla should be repotted every year or two, preferably in early spring. However, if you didn’t get around to pruning your mandevilla vine last year, it’s best to wait until fall, then prune and repot at the same time.

How to Repot Mandevilla

When repotting a mandevilla, prepare a pot no more than one size larger than the current pot. Ideally, the container should be slightly wider but not too deep. Be sure the pot has a drainage hole in the bottom, as mandevilla is susceptible to root rot in soggy, poorly drained conditions.

Fill the pot about one-third full of a lightweight, fast-draining potting mix such as a blend of commercial potting soil, sand, and compost. Remove the plant carefully from its pot. Trim any roots that appear dead or damaged.

Place the plant in the center of the pot. Adjust the soil in the bottom of the pot, if necessary, to ensure the mandevilla is planted at the same soil level as in its current pot. Planting too deeply can damage when moving to a new pot.

Fill in around the roots with potting mix. Firm the mix with your fingers, but don’t compact it. Water the mandevilla plant well and then install a trellis to support the vine. Put the plant in light shade for a few days while it acclimates to its new pot then move the mandevilla into bright sunlight. 

Dipladenia is a tropical vining plant similar to Mandevilla. Many gardeners grow Dipladenia vine from cuttings, either to grace a garden bed or patio or to grow in a pot as a hanging houseplant. If you are interested in rooting Dipladenia plants read on and we’ll tell you exactly how to do it.

Growing Dipladenia Vine from Cuttings

You can grow Dipladenia vine in your backyard if you live in USDA hardiness zones 9 through 11. It’s a real pleasure since the vine grows and flows to 15 feet (4.5 m.), perfect for balcony baskets. Its evergreen foliage lasts all year so can the lovely trumpet-shaped blossoms in warmer climates.

This vine also does well in hanging baskets on a patio or in a sunny living room. To get a potted plant started, all you need is to start rooting Dipladenia plants. 

How to Root Dipladenia Cuttings

Although starting some plants from cuttings is difficult, rooting these plants is easy. The plants root quickly and reliably from cuttings as long as you know the appropriate procedure for the Dipladenia cutting propagation.

The first step is to prepare the containers for cuttings. You will need to mix up potting soil that holds moisture but also provides excellent drainage. An equal mix of perlite, peat moss, and sand works well. Pack this mixture into small pots, squeezing out the trapped air.

To start rooting plants, place the pots in a cool space and poke fairly deep holes into the mixture in each. Then go out and take your cuttings. Take care to wear garden gloves, as the sap can irritate your skin.

Take 6 inch (15 cm.) cuttings from a healthy vine, opting for stems with lots of new leaves at the tip. Make the cuts at a 45-degree angle, then clip off all leaves on the lower half of each cutting. Dip the cut ends in rooting powder and insert one cutting into each prepared pot.

Move the pots to a warm, bright location using a heat mat to keep the temperature 60 degrees F. (16 C.) at night and 75 degrees F. (24 C.) during the day. Keep moisture high by misting the foliage, watering when the soil is dry, and covering pots with plastic bags.

After three weeks, the cuttings should have rooted and are ready to transplant.

Mandevilla, formerly known as dipladenia, is a tropical vine that produces an abundance of big, showy, trumpet-shaped blooms. If you’re wondering how to grow mandevilla from tubers, the answer, unfortunately, is that you probably can’t. Experienced gardeners have found that mandevilla (dipladenia) tubers function by storing food and energy, but don’t appear to be part of the plant’s direct reproductive system. There are several easy ways to start a new mandevilla plant, including seeds and softwood cuttings, but propagating mandevilla from tubers probably isn’t a viable method of propagation. Read on to learn more about mandevilla plant tubers.

Do Mandevillas Have Tubers?

Mandevilla plant tubers are thickened roots. Although they resemble rhizomes, they are generally shorter and plumper. Mandevilla plant tubers store nutrients that provide energy for the plant during the dormant winter months.

Storing Mandevilla Tubers for Winter isn’t Necessary

Mandevilla is suitable for growing year round in USDA plant hardiness zones 9 through 11. In colder climates, the plant needs a little help to get through the winter. It isn’t necessary to remove mandevilla plant tubers before storing the plant for the winter months. In fact, the tubers are necessary for plant health and shouldn’t be excised from the main plant. There are a couple of easy ways to care for a mandevilla plants during the winter months. Trim the plant down to about 12 inches, then bring it inside your home and place it in a warm, sunny location until the weather warms up in spring. Water the vine deeply about once a week, then let the pot drain thoroughly. Water again when the surface of the soil feels slightly dry. If you don’t want to bring the plant indoors, cut it back to about 12 inches and place it in a dark room where temperatures remain between 50 and 60 F. (10-16 C.). The plant will go dormant and needs only a light watering about once every month. Bring the plant to a sunny indoor area in spring, and water as directed above. Either way, move the mandevilla plant back outdoors when temperatures are consistently above 60 F. (16 C.).

Mandevilla is a beautiful, prolific flowering vine that thrives in hot weather. As long as it’s not exposed to cold temperatures, it will grow vigorously, reaching as long as 20 feet (6 m.) in length. If allowed to grow untended, however, it can start to get an unkempt appearance and not flower as much as it could. This is why pruning mandevilla vines at least once per year is recommended. Keep reading to learn more about how to cut back a mandevilla vine effectively.

Should I Cut Back Mandevilla?

This is a commonly asked question with a resounding, yes. Knowing when to prune mandevilla vines is key to continued health and vigorous blooms. Cutting back a mandevilla vine is best done in late winter or early spring, before the plant starts to produce new growth. 

Mandevilla vines put out new growth faithfully and quickly, and the summer’s flowers all bloom on this new growth. Because of this, cutting back a mandevilla vine drastically won't hurt it or particularly affect its summer display, as long as you do it before it puts out its new shoots. 

You can cut back old growth or branches that are getting out of hand straight down to the ground. They should sprout new strong stems in the spring. Even branches that aren’t getting unruly benefit from being pruned somewhat, encouraging new growth and giving the whole plant a bushier, more compact feel.

A single stem of old growth that’s cut back should sprout several shoots of new growth. Cutting back a mandevilla vine can also be done during the growing season. You should never prune new growth vigorously, because this will result in fewer flowers.

You can, however, pinch off the ends of new growth early in the spring, once it’s reached a few inches (7.5 cm.) in length. This should encourage it to split into two new shoots, making the whole plant fuller and more prone to flowering.

Gardeners appreciate mandevilla vines (Mandevilla splendens) for their ability to climb up trellises and garden walls quickly and easily. The climbing vine can cover a backyard eyesore quickly and beautifully. But using mandevilla vines for ground covers is also a good idea. The vine scrambles over a slope as fast as it climbs a trellis, and it can quickly cover a rise or a knoll where it is difficult to plant grass. Read on for information about using mandevilla vines for ground covers.

Mandevilla Ground Cover Info

The same qualities that make mandevilla an excellent climbing vine also make it great ground cover. Using mandevilla as a ground cover works well since the foliage is dense and the flowers attractive. The leathery vine leaves – up to 8 inches (20.3 cm.) long – are dark forest green, and they contrast beautifully with the bright pink flowers. The blossoms appear in early spring, and the mandevilla vine continues flowering prolifically through fall. You can find cultivars that offer blossoms in different sizes and colors, including white and red. Rapid growth is another wonderful trait of the vine that suggests using mandevilla as a ground cover. Mandevilla survives the winter in US Department of Agriculture plant hardiness zones 9 and 10, but gardeners in colder climates treat mandevilla as an annual. They plant mandevilla ground cover in early spring and enjoy its rapid growth and prolific flowers through the first frost. Since mandevilla vines require a trellis or other support in order to climb, you can use mandevilla vines for ground covers simply by planting the vine on a slope without a climbing support. The plant will still grow to 15 feet (4.57 m.), but instead of heading up vertically, it will spread foliage and flowers across the ground.

Caring for Mandevilla Vines as Ground Covers

If you are thinking of using mandevilla vines for ground covers, plant the vine in direct sun or light shade. Be sure that the soil drains well and offer the mandevilla regular irrigation. Keep the soil evenly moist. Do not allow it to get overly wet or to dry out completely. Caring for mandevilla vines includes offering the plant fertilizer. For best results, feed your mandevilla with fertilizer that has more phosphorus than nitrogen or potassium. Alternatively, add bone meal to regular fertilizer to increase the phosphorus content.

When does mandevilla vine bloom? How long do mandevillas flower? All good questions, and the answers depend on a number of factors. Read on for specific information about the mandevilla blooming season.

How Long is the Mandevilla Bloom Period?

How long is the mandevilla blooming season, and does mandevilla bloom all summer? Yes, you’ll usually see the first mandevilla flowers in early summer and the mandevilla bloom period lasts until the first frost in autumn. This beautiful vine is tougher than it looks, but it is killed by frost in USDA plant hardiness zones 8 and 9. However, the roots are still alive and the plant will grow back in spring. In climates north of zone 8, the plant may not survive the winter. The solution is to grow mandevilla in a pot and bring it indoors when temps reach about 40 to 50 degrees F. (4-10 C.).

Caring for Mandevilla Grown Outdoors

Plant mandevilla in partial shade and well-drained soil. Water the plant regularly, but allow the soil to dry between each irrigation. Fertilize mandevilla regularly during the growing season. To maintain your young mandevilla plant, train the vine to grow on a trellis. Pinch young plants to encourage bushy growth and prune as needed to maintain the desired size and shape.

Mandevilla Blooming Season for Plants Grown Indoors

Mandevilla is suitable for growing indoors year round, but this tropical plant needs a warm, sunny location such as a south-facing window, especially in winter. If possible, move the plant outdoors during the summer months. Water when the soil feels dry to the touch, then allow the pot to drain thoroughly. Fertilize the plant regularly during spring and summer. Repot the mandevilla plant to a slightly larger pot with a drainage hole every spring. Pinch wilted blooms regularly and prune the plant by half or less in late autumn.

Mandevilla is a summer favorite for its showy flowers and tropical flair. But unless you live in a warm climate, this stunning vine won’t last until next year. By overwintering mandevilla you can keep this gorgeous garden plant for years of enjoyment.

Perennial mandevilla plants will only survive winter if you live in a tropical climate in USDA hardiness zones 9 or above. It can’t tolerate temperatures below 45 to 50°F (7-10°C). So if you live in a cold climate, overwintering is a must.

There are a couple different ways you can care for a mandevilla over winter so you can grow it again next summer. I’ll walk you through when and how to overwinter a mandevilla so you can enjoy its beautiful blooms and dramatic vining foliage for years to come.

Benefits of Overwintering Mandevilla

Though many gardeners grow mandevilla as an annual, buying new plants each spring can be costly. These tropical plants are unable to tolerate cold, so if you live in a cold winter climate you will have to buy a new plant every year.

That’s where overwintering comes in. Bringing mandevillas indoors can help you cut costs because you can keep growing the same plant year after year.

How to Overwinter a Mandevilla

Wintering mandevilla plants indoors isn't difficult, provided you meet a few of their basic needs. First and foremost, timing is key. Bring mandevillas indoors for winterization before the first frost. Even brief exposure to cold is likely to lead to the loss of your plants. The best time to bring plants indoors is as soon as temperatures are consistently below 60°F (15°C).

Once your mandevilla plants are inside, you can begin the overwintering process. There are two ways you can overwinter mandevilla plants: as houseplants or in a dormant state. I’ll walk you through how to do both methods.

As a Houseplant

The first method of overwintering is growing a mandevilla indoors as a houseplant. To start, prune your mandevilla to a manageable size so it fits inside your home. These graceful, twining vines can grow up to 10 feet (3 m) in a single season, which is too large for most homes.

After pruning, put your mandevilla in a spot where it will get plenty of bright sunlight. Position the container near a sunny window, where it will receive bright, indirect light throughout the day. If your home is lacking in natural sunlight, an LED grow light, like this one from Amazon, can provide the correct amount of light a mandevilla needs.

Normal indoor room temperatures are fine for overwintering. Mandevillas do best with temperatures between 60-70°F (15-21°C). Keep plants away from drafts by positioning them away from heating and cooling vents.

Water your mandevilla every week and trim as needed to maintain the desired size and shape. Don't expect flowers, though, because mandevillas don't bloom during winter.

As a Dormant Plant

Many gardeners overwintering a mandevilla plant for the first time choose to do so by putting plants into a state of dormancy. This technique requires little care and allows you to overwinter more plants in a smaller space and with greater ease.

Put your plant in the sink and drench the soil and tubers thoroughly to wash out any common mandevilla pests that may be lurking in the potting mix. Then cut the entire plant back to about 10 inches (25 cm) with a pair of sharp, clean pruners. Garden pros, including Editor-in-Chief Melanie Griffiths, swear by these pruning shears from Felco on Amazon.

Next, place the plant in a dark room with temperatures between 55 and 60°F (12-15°C). Temperatures should not be allowed to dip below freezing, as that may harm plants. A heated garage is an ideal location. Water sparingly throughout the winter, providing only enough moisture to keep the potting mix from becoming bone dry.

In late winter and early spring, look for signs of new growth. This means plants are breaking dormancy. When that happens, move them to a warm, sunny room and resume watering and fertilizing mandevillas as normal.

What to Do in Spring

Mandevillas kept as houseplants are likely to resume active growth as the days lengthen in spring. You can begin to harden off plants at that time. That means gradually introducing plants to outdoor conditions over the course of several weeks.

If you put your mandevilla plants into dormancy, you can begin reawakening in late winter. Position plants in a sunny location. Active growth should resume over the course of several weeks. After plants begin greening up and showing signs of new growth and all chance of frost has passed, harden off mandevillas outdoors.

Either way you decide to winter your mandevilla, don't move it back outdoors until temperatures are consistently above 60°F (15°C). This is also a good time to repot mandevilla plants with fresh potting mix, like my favorite Miracle-Gro blend for potted plants, which you can find on Amazon.

Frequently Asked Questions

Vibrant, pink blooms and elegant, vining stems characterize the mandevilla plant. Getting a mandevilla plant to bloom in tropical to sub-tropical regions relies upon plenty of water and adequate sunshine. In cooler climates, the plant is only suitable for summer outdoor growing and may need a bit more babying as the season is short and the vines need to mature before blooming. There are a few tricks you can try if there are no mandevilla flowers on your plant. Mandevilla plants need nighttime temperatures of around 60 F. (15 C.) to force blooming. They cannot tolerate cooler temperatures of less than 40 F. (4 C.) and an outright freeze will kill the vine. Northern gardeners who wonder, “Why won't my mandevilla bloom?” may be in for some serious work to encourage this tropical wonder to brighten their landscape.

Why Won't My Mandevilla Bloom?

Mandevilla are heavy bloomers in the right conditions. You can even prune them to the ground in late winter or early spring, and the plant will grow back quickly and reward you with the astounding blooms on the new vines. If there are no mandevilla flowers on your plant, the cause could be cultural, improper site conditions, or temperatures that are too cool. Established plants that are mature will provide the best color display, so don't give up on young plants. They may simply need more time to bring out their flower show.

Cultural Reasons for a Mandevilla Not Flowering

These lovely plants need well-drained soil with plenty of humus added. Indoor plants thrive in a mixture of peat, potting soil, and fine sand. Potted plants should be fertilized every two weeks with high phosphorus plant food from spring through summer. Feed outdoor plants with a time-release bloom food in early spring. Avoid high nitrogen plant foods, as they fuel leaf and vine growth but do not promote flowers. Provide a support for the vines so the buds can receive plenty of sunlight. Temperatures cannot be too warm but situate the plants where there is protection from the searing heat during the hottest part of the day. Keep the fast-growing vine deeply watered but not soggy. Following these guidelines will generally prevent a mandevilla from not flowering.

Getting a Mandevilla Plant to Bloom

If you followed correct cultural care and siting, there is little reason a mandevilla plant does not bloom. However, in the rare cases where your vine just simply won't produce, you can force it to flower. Use a teaspoon (5 ml.) of Epsom salts dissolved in water once every two weeks for a month. The salt content will build up in the soil if you try this for any longer. The magnesium in the Epsom salts should get it flowering again. In potted plants, leach the soil with plenty of water after trying this treatment. Additionally, a mandevilla plant does not bloom if it hasn't been trained correctly. In young plants, pinch off the new growth to promote side shoots. Mandevilla bloom off of new growth so this may be just the trick to get new vines and enhance blooming.

Most gardeners will not forget their first vision of a mandevilla vine. The plants bloom from spring to fall with brightly colored, cupped flowers. Mandevillas are in the Periwinkle family of tropical to sub-tropical flowering vines and bushes. They are hardy in USDA plant hardiness zones 9 to 11, but you can overwinter them in cooler climes. Feeding mandevillas nourishes the growth and bloom flushes. The correct food and knowledge on how to fertilize a mandevilla will have you on the road to a glorious, season-long producer, with plenty of potential for consistent annual growth.

Best Time for Feeding Mandevillas

Apply mandevilla fertilizer in spring and summer every two weeks. The vine will go dormant in winter, so don't feed at that time or you may have a flush of tender new growth that will be harmed by cooler weather. Start in March in warmer zones and begin to increase watering. Plants that have been brought indoors should first be introduced to brighter light and acclimated gradually to the outdoors after all danger of frost has passed. Start feeding these potted versions in May. Use a mandevilla fertilizer on young plants that have a slightly higher nitrogen ratio to promote leafy growth. Feed for two weeks and then graduate to a balanced food that will promote buds and blooms.

How to Fertilize a Mandevilla

The plants respond well to a diluted food added to their irrigation water every two weeks. Potted plants, especially, require a liquid application followed by a good watering to get the food to the roots and prevent root burn. A granulated time-release fertilizer for mandevilla plants works on in-ground vines. It can be applied just once every month as the time-release formula gently discharges the food to the root system over a longer period. Suspend fertilizing a mandevilla in fall and throughout winter to avoid excess sensitive leaf growth and unsupported buds.

Fertilizer for Mandevilla Plants

Feeding mandevillas a balanced plant food provides basic nutritive input. A good 20-20-20 ratio food is useful for many types of plants as well as for fertilizing mandevilla. Choose an organic formula as part of a sustainable and clean landscape. For more blooms, you can apply a high phosphorus food every two to three weeks early in the flowering season. Phosphorus enhances the plant's ability to flower and promotes buds. You can tell if you have a high phosphorus count by looking at the middle number in the formula. You can also get a “bloom buster” food, but often these have levels of phosphorus that can be too high and toxically damaging to your plant. Change back to the balanced food halfway through the summer.

Mandevilla is a native tropical vine. It produces masses of bright, usually pink, trumpet-shaped flowers which may grow 4 inches (10 cm.) across. The plants are not winter hardy in most zones of the United States and have a temperature minimum of 45-50 F. (7-10 C.). Unless you are in the tropical south, you will need to grow mandevilla as a houseplant. This plant has particular needs and growing mandevilla vine indoors can take some space.

Mandevilla Growing Conditions

The vine is hardy to USDA zone 9, which means you need to grow mandevilla as a houseplant during the fall and winter in cooler climes. In nature the vines twine around any available edifice or support and can grow up to 30 feet (9 m.) in length. They prefer partial sun in rich moist soil with plenty of organic matter. As outdoor plants, they need water frequently and fertilizer every two weeks in spring and summer with a high phosphorus food. The plant will go dormant in winter and may even lose some of its leaves but will regrow when spring warms up the air. The best temperatures for mandevilla are above 60 F. (15 C.) at night.

Mandevilla as a Houseplant

Moving the plant to the interior provides different growing conditions for it. Therefore, it is important to know how to care for mandevilla indoors. Mandevilla houseplants should not be moved inside until you are sure there are no bug hitchhikers. Mandevilla houseplants are a bit fussy and require special growing conditions. In its habitat it can grow 7 to 10 feet (2-3 m.) per season, so this isn't a little counter top or window box houseplant. Trim the plant as needed to keep it in the confines of the room in which it is growing. A greenhouse environment is ideal or you can grow the plant near a sunny window with some protection from scorching midday sun. If you are growing mandevilla vine indoors, don't be surprised if it doesn't flower. You would need excess high artificial light to force buds and blooms. The plant will not bloom when overwintering mandevilla inside and goes dormant until brighter spring light arrives.

How to Care for Mandevilla Indoors

You can just grow it like a regular plant inside or you can cut it back to just 8 to 10 inches (20-25 cm.) and pot it up. Move the pot to a cool, dim area where temperatures average 55 to 60 F. (13 to 15 C.). Cut watering in half during the dormant period and remove spent leaves and dead plant material in spring. The indoor mandevilla plant needs to remain fairly dry to prevent rot. Keep the indoor mandevilla plant moderately dry over the winter and with a little luck you will see sprouts in spring. Move the pot to a sunny location and pinch the shoots to force bushier growth. Start fertilizing every two weeks with a high phosphorus plant food.

It's hard not to admire the way a mandevilla immediately turns a plain landscape or container into an exotic riot of color. These climbing vines are usually pretty easy to take care of, making them a favorite of gardeners everywhere. Unhealthy mandevilla plants can leave your landscape looking sad and ragged, so keep an eye out for these common diseases on mandevilla.

What Diseases Do Mandevilla Plants Get?

Mandevilla disease problems are usually caused by humid, wet conditions and overhead watering. These cultural problems encourage many types of mandevilla diseases originating from fungal spores or bacterial colonies, but if they're caught early they can often be treated. The most common diseases on mandevilla and their treatments are outlined below.

Botrytis Blight

Botrytis blight, also known as gray mold, is most troubling when the weather has been cool, but moist. It causes foliage to wilt, with brown areas of tissue developing within healthy green tissues. A gray-colored mold may encase buds and leaves, and rotting can occur along stems and into roots. Neem oil or copper salts can be applied to vines just starting to show signs of botrytis blight. Thinning the vine and creating better air circulation can help dry out the fungal spores. Watering at the base of the plant will prevent splashing spores onto uninfected leaves.

Crown Galls

Crown galls are swollen tissue growths around the base of the vine caused by the bacterial pathogen Agrobacterium tumefaciens. As the galls expand, they constrict the flow of fluids and nutrients from the roots of your mandevilla, causing the plant to slowly decline. If your plant has many large knob-like growths at its base and stretching into its roots, you may be dealing with crown gall. There is no cure; destroy these plants immediately to prevent the disease from spreading.

Fusarium Rot

Fusarium rot is another fungal disease that can cause serious problems for mandevilla. It's very difficult to control once it has taken hold, so watch for early symptoms like sudden yellowing or browning of leaves limited to sections of the vine. If left alone, the plant will rapidly collapse as fusarium fungal bodies clog transport tissues. Drench your plant with a broad-spectrum fungicide like propiconazole, myclobutanil or triadimefon as soon as symptoms begin.

Leaf Spots

Leaf spots result from a variety of fungi and bacteria that feed on leaf tissues. Leaf spots may be brown or black, with or without yellow halos around damaged areas. Some spots may grow rapidly until they engulf the infected leaf, causing it to die and drop. Positive identification is always best before treating leaf spots, but when time is short, try a copper-based spray, since they are often effective against both bacteria and fungi. Neem oil is among the best treatments for fungal leaf spots.

Southern Wilt

Southern wilt (also known as southern blight.) is a less common, but devastating bacterial disease that may originate in greenhouses. Symptoms include yellowing and browning of lower leaves followed by leaf drop as the disease moves up the plant's stem. Infected plants will die; there is no cure. If you suspect southern wilt, destroy the plant to protect your landscape from potential infection. Note: Any recommendations pertaining to the use of chemicals are for informational purposes only. Chemical control should only be used as a last resort, as organic approaches are safer and more environmentally friendly.

There's nothing stopping your tough and beautiful mandevillas as they scramble up the brightest trellis in the garden -- that's why these plants are such favorites with gardeners! Easy and carefree, these vines rarely fail; when they do, it is often because of the few insect pests of mandevilla. Read on to better understand mandevilla bug infestations and cures.

Mandevilla Pest Problems

Mandevilla vines are tough plants, but even they are subject to a few pest insects that can cause real problems. Bugs on mandevilla vine are easy to treat if they're caught early, but you'll have to keep a close eye out for them since these insects often remain well-hidden.

Mealybugs

Mealybugs leave small piles of waxy debris on the branch crotches of mandevilla vines, feeding nearby or on the undersides of leaves. These pests produce copious amounts of honeydew as the pests feed on plant juices, causing leaves below feeding sites to appear sticky or shiny. Ants may cluster near these sites, collecting the honeydew and defending the mealybugs from harm. Spray your plant with insecticidal soap and recheck it often for signs of mealybugs. If leaves continue to yellow and drop, you may need to spray your plant weekly to destroy new mealybugs as they emerge from their waxy egg sacs.

Scale

Scale insects are the most difficult of the mandevilla pests; they are experts at camouflage, often appearing as irregular growths or waxy deposits on stems and leaves. Some scale produce honeydew, like mealybugs, but insecticidal soaps will rarely take them out due to their hard coverings. Neem oil is the spray of choice for scale, and weekly spray treatments are the norm. If you notice the scale bugs are changing colors or your plant begins to recover, lift some of the scales' hard covers to check for signs of life.

Spider mites

Spider mites are usually difficult to see with the naked eye, but their damage is unmistakable -- individual leaves are suddenly covered in tiny, yellow dots that may grow together before the leaf dries and falls off the plant. Spider mites also weave fine strands of silk where they're feeding, which can aid in your decision to treat them. Spider mites are attracted to dusty conditions, so if your plant isn't too punky, start by spraying down any dry spots and cleaning the dust off your plant's leaves, especially indoors. If spider mites persist, insecticidal soap or neem oil are recommended.

Whiteflies

Whiteflies are tiny, moth-like insects that congregate in large groups on the undersides of leaves. They cause similar damage to mealybugs, stressing leaves until they drop, but are extremely visible and easy to identify. You may notice tiny white insects flying up when you bump your plant or walk too close; check the plant carefully for feeding sites when it starts to look unwell. Whiteflies drown easily, so they can usually be cured with regular sprays from a garden hose.

Tropical plants have a special place in my heart. My gardening zone is not at all sultry, warm and humid, but it doesn't stop me from purchasing a bougainvillea or other tropical plant for outdoor use. The plants thrive in summer but have to be moved indoors in the cooler season. Dipladenia, a favorite, is a South American native that grows in tropical forests. 

The plant is similar to mandevilla vine and works outside in warm zones, or indoors as an accent houseplant. We will discuss the difference between dipladenia and mandevilla so you can decide which of these amazing flowering vines is the best option for your garden.

Mandevilla or Dipladenia

Dipladenia is in the Mandevilla family but has a decidedly different growth pattern. Mandevilla vines climb up vertical structures to seek the canopy light. Dipladenia is a bushier plant whose stems grow down and hang. 

The two plants have similar brightly colored flowers, but mandevilla has a larger flower typically in red. Both plants need the same bright light and dipladenia care is the same as that for the mandevilla vine. When deciding between a mandevilla or dipladenia, the finer leaves and smaller flowers in a wide range of colors may win the day for the dipladenia.

Dipladenia Facts

Dipladenia has a fuller shape than the mandevilla. A major difference between dipladenia and mandevilla is the foliage. Dipladenia leaves are fine and pointed, deeply green and slightly glossy. Mandevilla vine has larger leaves with a broader shape. The flowers are trumpet shaped and full in hues of pink, white, yellow and red. 

The plants respond well to pinching as they grow, which forces out new bushier growth. Unlike the mandevilla, dipladenia doesn't send out as much upward growth and doesn't need staking. One of the better dipladenia facts is its ability to attract hummingbirds and bees. The tubular flowers are a vibrant signal to pollinators as ample suppliers of nectar.

Growing a Dipladenia Plant

This plant requires warm temperatures for best performance. Nighttime temperatures should remain around 65 to 70 F. (18-21 C). If you want to know the precise temperature outside, the Springfield Big and Bold Thermometer with Mounting Bracket from Amazon is weather-resistant and perfect for all seasons. Water the plant frequently in the summer but let the top few inches of the soil dry out before watering anew. 

The plant can go in the ground in warmer areas or stay in a pot. Bright but indirect sun is a requirement for growing a dipladenia plant. The best flowers are formed in a well lit area. Pinch off gangly growth when the plant is young to force thicker stronger branches. 

The only difference between mandevilla and dipladenia care is that mandevillas require a trellis or staking. Dipladenia only needs a stake to keep the little plant straight as it matures. Fertilize every three to four weeks during the growing season with a liquid plant food, like this Miracle-Gro Pour & Feed Plant Food from Amazon, as part of good dipladenia care. 

Overwinter indoors or in a greenhouse and suspend fertilizing in winter. With a little luck, even northern gardeners can keep the plant growing indoors until the heat of summer arrives.

As a favorite outdoor blooming plant, the mandevilla often gets special attention from the enthusiastic gardener. Some are disappointed when finding yellow leaves on a mandevilla. Following are some answers for the gardening question, "Why are my mandevilla leaves turning yellow?"

Reasons for Yellow Mandevilla Leaves

There are a number of causes to a mandevilla plant turning yellow. Below are some of the most common reasons for yellow mandevilla leaves:

Improper Watering

Improper watering can cause yellow leaves on a mandevilla. Too much or too little water can be reasons for yellow mandevilla leaves. Soil should remain moist, but not soggy. If roots are soggy, remove the plant from the container and remove as much of the soggy soil as possible. Repot in fresh soil that is barely moist. Waterlogged roots are a common reason for the mandevilla plant turning yellow, as is dried out soil. If the plant is getting too little water, leaves will curl as they yellow. Water if necessary. Bottom watering can be effective in this case, as the plant will only take up the water it needs.

Nutrient Imbalance

Lack of the right fertilizer can also be responsible for yellow mandevilla leaves. If it has been a while since feeding your plant, then it's likely your mandevilla plant turning yellow is due to a lack of nutrients.

Natural Age

If the mandevilla plant is older, some yellowing leaves are to be expected as they die to make room for new growth. A few yellow leaves on a mandevilla can be removed. When removing the yellowing leaves, take a close look at the rest of the plant, particularly on the underside of the leaves and in the axils of the leaves and stems where insects are common.

Pest Attacks

Insects can cause yellow leaves on a mandevilla. Mealybugs, spider mites, and aphids can weaken plants and are sometimes reasons for yellow mandevilla leaves. If mealybugs have taken up residence on the plant, small spots of white cotton-like material will be visible. This houses the eggs of the mealybug, where hundreds may hatch and feed on the plant. Regardless of the pest, treating yellow leaves on mandevilla is done effectively with an insecticidal soap spray or a horticultural oil such as neem oil. Large infestations may require a systemic insecticide when treating yellow leaves on mandevilla. Until you determine what is causing yellow leaves on a mandevilla, seclude it from other plants so insects or disease do not spread to healthy plants. You can then determine the problem and begin treating yellow leaves on mandevilla.

Disease Issues

Sometimes the reasons for yellow mandevilla leaves are from disease pathogens, such as Ralstonia solancearum, the bacterial pathogen that causes Southern wilt. Plants may be fine in cool weather and when temperatures warm, pathogens may be reasons for yellow Mandevilla leaves. Plants with Southern wilt eventually die. All plant material, soil, and containers should be discarded to avoid the spread of the pathogen. Too much sun is often blamed because the gardener does not ask, "Why are mandevilla leaves turning yellow?" until temperatures have warmed, and the plant has been located in full sunlight.

Mandevilla vine is known for its showy blooms. Largely grown in containers or hanging baskets, this tropical vine is generally treated as a houseplant, especially in cooler regions. In southern climates, it can be set outdoors in spring but returned inside prior to winter. Learning how to propagate mandevilla is easy. Mandevilla propagation is accomplished by seed or cuttings.

How to Grow Mandevilla Seeds

Propagating mandevilla from seed isn't difficult, though it is best achieved with fresh seeds. Seedpods should be allowed to remain on the plant to dry before removing them. These can be easily recognized by their inverted v-shaped appearance. 

Once the mandevilla seed pods have dried, they will turn brown in color. They will also begin to split open, revealing fluffy, dandelion-like seeds. At this time the seeds are ready to be collected. For better results, soak the mandevilla seeds in water for about twelve hours prior to sowing them in well-draining soil. 

Mandevilla seeds require shallow planting, only covering them slightly with soil. Keep these moist and warm, about 65 to 75 degrees F. (18-24 C.), and place them in bright, indirect light. The seeds should germinate within a month or so.

How to Propagate Mandevilla Cuttings

Mandevilla vine is very easy to propagate from cuttings. While the best time to take cuttings is in spring, you can also take them in late summer or fall with some success. 

Cuttings should be made from tips or side shoots and about 3 inches (8 cm.) long. Remove all but the top two leaves. If desired, dip the mandevilla cuttings in rooting hormone and then stick them in a sandy peat mix. Place the mandevilla cuttings in a somewhat shady area and keep them warm, moist, and humid. In fact, it may be helpful to place them in a plastic bag (with small air holes to release excess moisture). 

Once roots develop within a month or two, you can pinch back new growth to promote bushier growth if desired. Mandevilla propagation is just that easy. Now that you know how to grow mandevilla seeds or root mandevilla cuttings, you can grow this lovely vine year after year.

The mandevilla plant has become a common patio plant, and rightfully so. The brilliant mandevilla flowers add a tropical flair to any landscape.

With over 100 species, Mandevilla is a diverse genus. These tropical vines are prized for their beautiful trumpet-shaped blooms and ability to quickly cover arbors and trellises. Though mandevilla flowers will require a frost-free climate in order to perennialize, many gardeners have found success growing them as an annual or indoors in containers. Read on for the basics of mandevilla care.

Quick Facts about Mandevilla

• Botanical name - Mandevilla spp.
• Height - 3-10 feet (1-3 m)
• Spread - 3-20 feet (1-6 m)
• Sun exposure - Full Sun, Part Sun
• Soil requirements - Well-Draining
• Hardiness zones - USDA Zones 9-11
• When to plant - Spring

When & Where to Plant Mandevilla

Mandevilla is most often planted in spring, after all chances of frost have passed and the soil has warmed. As the plants will languish under cool conditions, growers living outside of their hardiness range should wait until nighttime temperatures no longer dip below 50 F (10 C). Gardeners in regions that are known for their mild temperatures may require the use of greenhouses or cold frames in order to successfully grow the plant outdoors.

Tips for Mandevilla Care

When you buy your mandevilla vine, chances are good that it’s a lush plant full of flowers. You may wish to transplant it to the ground or into a bigger or more decorative container. Here are the basic mandevilla care requirements you need to follow.

Soil

Like many plants, mandevilla will thrive under a range of soil conditions. That being said, it performs best in rich soil that doesn't hold water -- work in compost or other organic material before planting to create nutrient-rich, well-draining soil conditions. Mandevilla in pots are most often planted in a quality growing medium that has been mixed with peat moss or sand.

Fertilizer

As mandevilla is considered to be a heavy feeder, routine fertilization will be a key aspect of its care. This is most often achieved through the use of a well-balanced feed designed for ornamental plants. If you want spectacular flowers, consider a fertilizer that is higher in phosphorus, like this Espoma Triple Phosphate Fertilizer from Amazon. Apply fertilizer in spring, continuing every two weeks through mid-summer.

Water

Mandevilla plants require consistently moist soil. At the same time, you should make certain to avoid getting them excessively wet or waterlogged. Supplemental irrigation may be required in regions that are especially dry, but it's generally not required. Those growing the plant indoors may also find that occasional misting is needed to maintain humidity levels. You can use a spray bottle like these from Amazon to mist the plants.

Light

Mandevilla vines need full sun in order to flower well. They can tolerate partial shade, however. Plants grown in containers or in regions that are especially warm may benefit from afternoon shade.

Mandevilla Plant Care

Routine mandevilla care will help growers in maintaining the general appearance of their plants.

Pruning

At the beginning of the growing season, you may want to pinch your vining mandevilla. This method of pruning your mandevilla will create a bushier and fuller plant. To pinch your mandevilla vine, simply use your fingers to pinch off 1/4 to 1/2 inch (0.6-1 cm) off the end of each stem.

Safety

Wearing gloves and other protective gear will be essential when handling mandevilla plants, as exposure to its sap may cause rash, blistering, and other types of skin irritation.

Trellising

Mandevillas are vines and they will need some kind of support in order to grow as best they can. Be sure to provide a trellis or some other support for your mandevilla vine's new growth to follow.

Propagating Mandevilla

Though it is possible to grow mandevilla from seed, most plants are purchased from home and garden centers. You can also propagate mandevilla plants by taking cuttings. Stem cuttings, approximately 4-6 inches (10-15 cm) in length, can be rooted in a quality potting mix. Throughout their period of establishment, growing medium should remain consistently moist. A humidity dome is often necessary in order to maintain humidity and encourage rooting. You can expect mandevilla cuttings to root in roughly 1-2 weeks.

Problems, Pests, & Diseases

Several insects may affect the overall appearance of mandevilla foliage. These pests include whiteflies, mealy bugs, and mites, which are especially common in houseplants. Foliar diseases, such as anthracnose, may further lead to the decline of plant health. Symptoms of infection include the formation of spotted lesions, as well as yellowing and premature drop of leaves.

Winter Care for Mandevilla

Mandevilla vines vary in growth habit. While some species remain evergreen throughout the entirety of winter, others will die back or lose their leaves.

Temperature

Mandevilla is a tropical vine, and exposure to cold temperatures will cause it to die back quickly. Therefore, those who have planted mandevilla in cooler climates may need to protect plants from sudden dips. Plants which have been allowed to slip into dormancy will also die back. At this time, you should prune back each stem.

Growing Mandevilla Year-Round

The mandevilla plant is often thought of as an annual but, in fact, it is very frost tender perennial. Once temperatures go below 50 degrees F (10 C), you can bring your mandevilla plant indoors for the winter.

When you bring your mandevilla flowers indoors, be sure to check the plant carefully for pests and treat these pests before bringing it into the house. You may want to cut back the plant by up to one-third.

Once indoors, place your mandevilla vine in a place where it will get bright, indirect light. Water the plant when the soil is dry to the touch.

In the spring, when the temperatures are consistently above 50 degrees F (10 C), remove any dead leaves and move your mandevilla plant back outside to enjoy for another summer.