7 Drought-Proof Container Plants That Stay Lush Through Heatwaves – Even When Everything Else Is Wilting

If there are gardeners out there who look forward to heatwaves, I haven’t met them. It’s pretty awful to wake up to a hot morning when the heat just keeps getting hotter as the day goes along.

Many popular garden plants make it through a heatwave because they have roots that go deep into the soil where there is moisture. But when those same plants live in containers, there is no deep soil and no room for deep roots. Container plants have a very limited amount of soil, and that soil dries out quickly during summer droughts.

That doesn’t mean that all container plants are doomed in summer heat. The best drought-tolerant container plants thrive in hot weather and with reduced water. Succulents and cacti are at the top of the list, but there are plenty of other low-water, heat-loving plants that bring color and interest. Below are seven of my favorites, and some tips for helping container plants survive heatwaves.

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Helping Container Plants Survive Heatwaves

You can help your container plants thrive in a heatwave by taking a few precautions. Be sure the plants you leave out during a heatwave are drought-tolerant and like the heat – but their maturity is important too. Don't leave new, young perennial plants outside during a heat wave. Give them a year to establish.

Otherwise, follow these tips:

• Water your container plants in the early morning every day.
• Water until you see water coming out of the drain holes.
• Add a 2–3 inch layer of mulch on the top of the soil in every container. Use organic compost, chopped dry leaves, or wood chips.
• In truly scorching weather, move the containers out of the sun for the afternoon. A location with morning sun and afternoon shade is best.
• Don’t fertilise plants at all during hot weather. Wait until cooler weather comes in.

Heatwave Garden Essentials

1. Silver Jade Plant

The silver dollar jade plant (Crassula arborescens) is an attractive succulent with round, puffy blue-gray leaves edged in a rich wine color. Native to South Africa, this striking plant has thick stems and starry white or pink blossoms in spring.

You can buy a variety pack of jade plants online from Altman Plants at Lowe's.

Jade is a perfect container plant in USDA zones 9-11. Its relatively short roots need well-draining soil and minimal water. In fact, too much water will rot the roots of this plant. Like other succulents, silver dollar jade plant stores water in its puffy leaves to use during times of drought. This is one of those plants you can set on a patio, admire every few days, and neglect the rest of the time.

2. Russian Sage

Are there any plants with stunning flowers that actually grow best in a full-sun, arid location? There are indeed, and Russian sage is one of them. It’s an erect shrub that prefers full sun in well-drained soil. It performs best in dry, arid conditions.

Russian sage forms clumps that rise to 3 feet (1 m) tall, with sturdy upright stems and silvery-gray leaves. They have a pleasing pungent aroma when touched. The tubular purple flowers appear from June to October. Cultivars like 'Blue Spire ' and 'Blue Mist' produce better flowers than the species plant.

You can plant Russian sage in a container on a sunny patio, but you might want to select a dwarf cultivar like Denim ‘n Lace from Plant Addicts, or Little Spire, available at Lowe's. Give the container an occasional deep watering, then leave it alone until it’s completely dry.

3. Purple Fountain Grass

Oh la la, this is a lovely fountain grass plant! It’s graceful and colorful, with waves of soft purple plumes arching up from burgundy-tinted foliage. Purple fountain grass (Pennisetum setaceum 'Rubrum') is the superstar of fountain grass, dramatic in containers or mass plantings.

With its short roots, purple fountain grass thrives in containers as an annual, and as a perennial in zones 9–11. It is free of pests and diseases, and tolerant of hot sun and minimal water. Planted in large containers, this grass can grow up to 5 feet tall, making a fabulous frame for entryways when placed on either side of a doorway, adding visual interest with its height, movement, and color.

Buy purple fountain grass online from Nature Hills.

4. Thorncrest Century Plant

Thorncrest century plant (Agave univittata ), a type of agave, grows wild in the Rio Grande Plains, thriving in dry, well-drained, rocky soil in zones 9–11. This qualifies it to take its rightful place among the best, drought-proof container plants that stay lush in heatwaves. Try this attractive Quadricolor variety from Altman Plants via Amazon.

Agave forms a rosette of leaves at its base; lovely, dark green leaves with a lighter green stripe down the middle. These large leaves heap up to about 2 feet (60 cm) tall. Then, of course, they flower – but don’t hold your breath. Agaves only bloom once in a lifetime, but when they do, what a show! The flower stalk appears in spring and shoots up to 10–15 feet (3–5 m) tall.

Thorncrest century plant is a fuss-free container plant that doesn’t need much water. Put it in a spot that gets sun. If you live in a cooler zone, you can still grow century plant. Set it up in a container and move it indoors during winter.

5. Asiatic Jasmine

Common jasmine is a lush climbing vine with gorgeously fragrant white blossoms that requires regular water to leaf and flower. But Asiatic jasmine (Trachelospermum asiaticum) – unrelated to the real jasmine clan – is an evergreen, vine-like woody plant that makes a good, drought-proof perennial for containers in zones 7–10. In cooler zones, it can be grown as an annual.

Variegated varieties, like the new Snow-N-Summer Asiatic Jasmine, available at Plant Addicts, are particularly stunning, with foliage spanning pink, white, and green.

While many use Asiatic jasmine in the landscape for alternative groundcover, this plant, with tiny yellow “pinwheel” flowers, also does well in containers placed in the shade or sun. It will grow to 3 feet (1 m) tall and half that wide. Gardeners in Florida often choose Asiatic jasmine given its hardiness and drought tolerance. Once established, this jasmine needs very little care.

6. Rosemary

Native to the hot Mediterranean area of Europe, rosemary (Salvia rosmarinus) offers so much that you can’t pass it up as a drought-tolerant, heat-loving plant. This shrubby perennial herb has truly lovely blue flowers as well, attracting oohs and aahs and pollinators. Driving through Spain, I’ve seen wild fields of rosemary so beautiful that they took my breath away.

Rosemary is drought-tolerant and grows best in full sun in warm areas. Can you grow it in a pot? It’s best, since the shrub doesn’t like much moisture in its soil, and soil in a container stays drier than soil in the ground. Rosemary thrives in zones 7–11. In colder areas, grow rosemary in a container and bring it inside for the winter.

7. Cushion Spurge

Never heard of cushion spurge (Euphorbia epithymoides)? Well, say hello to one of the most drought-tolerant perennials for USDA zones 4 to 8. The plant’s flowers are lovely, yellow blooms backed by chartreuse bracts on a plant that grows to about 18 inches (50 cm) tall. The second show happens in fall when the foliage changes to orange and red.

Cushion spurge is a great choice for patio container plants; just pick a large container with adequate drain holes. This plant is happy but will also thrive in partial shade, though too much shade will make the cushion spurge leggy, rather than its classic cushion shape.

Another good spurge for containers that has a similar cushion-like growth habit is Tiny Tim dwarf spurge, available at Walmart.