Backyard Looking Tired? As a Master Gardener, I Swear By These 8 Summer Rescue Plants for Instant Color

When the dog days of summer arrive, your borders may start to look tired and droopy. Those plants you joyfully tucked in or started a couple of months back are losing their vigor (after all, they’ve performed well for weeks now). And perennial mainstays that have already bloomed are leaving unsightly gaps. If you want to save your borders from this noticeable slump, it’s high time for a midsummer refresh!

To give your yard a midsummer pick-me-up, you can deadhead faded summer blooming plants, shear spent perennials for a second flush, and renew mulch if needed. But for an instant facelift, replace the worn-out annuals that are buggy, diseased, leggy, or are going to seed. At this point, you need tough yet beautiful annual bloomers that thrive in summer heat and humidity, or perennial all-stars that are famous for their heat and drought tolerance.

By introducing some select established plants now, you can bypass the fragile seedling stage and enjoy a festival of color that will take you easily and cheerfully into fall. These resilient beauties hit the ground running, instantly closing gaps and turning a weary, fading border into a vibrant, texturally rich sanctuary. Meet the rescue squad that can pump out color all the way through to the first frost.

Try These 8 Summer Rescue Plants

Planting in July is fundamentally different from planting during a cool, damp spring. The soil is likely baked, which means new root systems could be vulnerable to thermal shock and moisture loss. Before planting these instant color plants, take a moment to evaluate your USDA hardiness zone and localized microclimate. Deeply sun-baked, wide-open spaces suit heat-loving tropicals, while partially shaded gaps are best for resilient options that can bloom without full-day sunshine.

To give these floral rescue workers the best start, ground-level preparation is key. You need to create a loose, highly moisture-retentive pocket, so new plant roots can anchor instantly. Gently clear out weeds and old plant roots from the vacancy. Then use a soil diagnostic tool like the Yamron 4-in-1 (Moisture, Temperature, Light and pH Meter, available from Amazon, to check your planting site isn’t too depleted from spring's heavy feeders.

If your soil feels heavy, packed down, or spent, give it a quick pick-me-up with a little aged compost, plus some perlite or coarse sand for drainage. You might also like to try a scoop of Wakefield Biochar Premium Soil Conditioner from Lowe’s to add beneficial microbes at the root level. Then check out the following summer-slump rescue plants to add instant color to your garden borders.

1. Periwinkle

Vinca or periwinkle (Catharanthus roseus) is one plant that needs its praises sung more often. These summer rescue plants love heat and humidity, and don’t need a lot of water – and their bright flowers bloom until the first frost. Perennial in zones 9-11, they are usually treated as an annual. Plant them in full sun, where their mounding, shiny green foliage can reach 16 inches (41cm) tall and 22 inches (56cm) wide. You can buy purple Periwinkle Plants from Fast Growing Trees.

The number-one golden rule with vinca is to avoid overwatering, as these plants despise wet feet. Plant them in fast-draining soil alongside fine-textured partners like ornamental grasses or blue salvia varieties for a gorgeous contrast. And sprinkle some Espoma Organic Plant-Tone Plant Food from Amazon around the base for a gentle way to nourish that glossy foliage during intense August heatwaves.

2. Begonia Big Series

The Begonia BIG Series (B. x benariensis) is always in bloom and grows quickly. Its succulent stems will forgive a lapse in watering. Loose clusters of single or double flowers bloom in white, pink, red, or bicolor. Foliage is dark green to bronze on compact plants reaching 12-18 inches (30-46cm) tall and wide. Flowers are also self-cleaning, so this plant doesn’t need deadheading. It tolerates sun or shade, so you can use it anywhere the garden needs a pick-me-up. Grow as an annual except in zones 10-11. You can buy red Begonia BIG plants from Cheryl’s Greenhouse.

While these begonia varieties are highly self-sufficient, they appreciate a timely feed. Scratch a handful of Espoma Organic Chicken Manure from Walmart into the surrounding soil to give them the slow-release nitrogen required to keep those heavy, fleshy stems multiplying without snapping in summer storms.

3. Crossandra

Crossandra (C. infundibuliformis) is another great garden performer that needs more love. It sails through summer without a care, always looking pristine with its shiny, green leaves and bright orange flowers. The flower petals stack on a center spear, giving the flower layers. This rescue plant will even bloom indoors. It only needs part shade, moderate water and well draining soil. Once or twice a season, feed it with a slow-release balanced fertilizer such as 10-10-10 or Miracle-Gro Water Soluble All Purpose Plant Food from Lowe’s for continuous blooms.

Often called the firecracker flower, it brings a vivacious splash to the garden with its overlapping fan-shaped blossoms. It is an exceptional rescue choice for brightening up awkward, humid gaps. Deadhead spent spears to keep it tidy. Hardy in zones 9-11, you can treat it as an annual or bring it indoors for winter. You can buy Crossandra by the Tropical Plants of Florida Store from Amazon as potted plants.

4. Garden Phlox

Garden phlox (P. paniculata) blooms from summer to fall on stems 2-4 feet (0.6-1.2m) tall. Its clusters of fragrant flowers remind me of hydrangea blooms. Pollinators love phlox, especially butterflies. This rescue plant just needs full sun to keep powdery mildew at bay. In hot climates, partial shade is fine. Hardy in zones 4-8, phlox prefers moist, fertile, well-drained soil. You can buy Coral Creme Drop Garden Phlox from Nature Hills.

Plant towards the middle or back of borders, pairing with spiky coneflowers or golden rudbeckia for a classic cottage look. Water deeply at the base, and feed every fortnight with Neptune's Harvest Fish & Seaweed Fertilizer from Amazon to deliver rich organic trace minerals that maximize blossom size and perfume strength.

5. Coleus

Coleus (C. scutellarioides) is perfect for instant color in a partially shady area. Heights average 1-2 feet (0.3-0.6m), and their colorful foliage is a glorious combination of green, pink, chartreuse, cream, burgundy, red, yellow, or purple. Pinch off the flower spikes as they appear, so the plant will focus on leafy growth. I often leave a few spikes on one plant for the hummingbirds. For a burgundy splash, buy Coleus ‘Dipt in Wine’ by the Plant Nook Store from Amazon as starter plants.

These plants need fertile, moist soil. They are hardy in zones 10-11, so most folks treat them as annuals. If you want to overwinter your favorite coleus, take cuttings in fall and root them in water or potting soil. To prevent lower leaf drop and downy mildew, mist the foliage with Arber Organic Bio-Fungicide Concentrate from Walmart.

6. Sunflowers

Sunflowers (Helianthus x annuus 'TMSNBLEV01') are summer icons, especially when it is hot and dry. Variety SunBelievable ‘Brown Eyed Girl’ is a great summer rescue plant, as it doesn’t set seed. Instead, it produces flowers continuously until the first frost. Its multi-branched stems grow up to 3 feet (0.9m) tall and wide. Plant in rich, well-draining soil in full sun and only water when the soil is dry. You can buy Sunflower SunBelievable Brown Eyed Girl Helianthus by Monrovia from Armstrong Garden Centers, as potted plants.

What makes this hybrid an unparalleled rescue option is its non-stop branching habit. Traditional single-stem sunflowers are a one-and-done show, but this bloomer fills border vacancies in no time and keeps going. Topdress the planting zone with Worm Bliss Premium Earthworm Castings from Amazon. This improves moisture holding capacity, while releasing a steady stream of essential nutrients.

7. Coneflowers

Coneflowers (Echinacea spp.) are quintessential rescue plants for heat tolerance in high summer. Purple coneflower is great for the pollinator garden, while new forms and hybrids feature white, yellow, red, pink, orange, and multi-color blooms, many with compact forms. They bloom continuously until first frost, especially if deadheaded. Hardy in zones 3-9, they thrive in moist, well-drained soil. Buy PowWow Coneflowers from Fast Growing Trees for vibrant drought-tolerant color.

For ultra summer grit, compact cultivars like Cheyenne Spirit or Sombrero offer thick, sturdy stems. When introducing it in summer, just don’t let the rootball dry out. Add a scoop of Down to Earth Fish Bone Meal from Amazon for rapid root establishment, and keep it watered deeply twice a week until it settles into its new home.

8. Pentas

Pentas (P. lanceolata) are some of my favorite pollinator plants and my yard is never without them. Their colorful clusters of flowers bloom from spring to frost, and attract plenty of butterflies and hummingbirds. Pentas prefers moist, well-drained soil, but are drought tolerant once established, and happy in full sun or partial shade. Typically grown as an annual, these rescue plants are hardy in zones 10-11. You can buy vivid purple Pentas Lanceolata from Amazon.

Known affectionately as Egyptian starclusters, their striking flower heads are made up of dozens of tiny stars, creating a rich texture in front-of-the-border displays. Add a bit of micronutrient-dense Dr. Earth Premium Gold All Purpose Fertilizer from Walmart into the surrounding soil at planting time for seamless, gorgeous growth.

Midsummer Maintenance

To keep perennials blooming, shear back early bloomers like catmint, yarrow, salvia, and bee balm for a second flush. Some varieties, like Walker’s Low catmint, will continue to bloom whether or not they are cut back. You should also remove any dead or damaged stems you see.

Deadheading will encourage annuals like cosmos and zinnias to repeat-bloom rather than set seed. Perennials such as coneflower, blanket flower and phlox also benefit. Phlox is sneaky, though: when the petals first fade and drop off, new buds appear. So wait until you don’t see any more new buds before trimming phlox. Use a sharp pair of shears, scissors or snips for clean cuts. We love Fiskars Micro-Tip Pruning Snips from Amazon for their ability to slide between tight nodes.

A fresh sprinkling of mulch will help the plants retain moisture. Add a two-inch (5cm) layer of organic mulch, such as Back to the Roots Organic Premium Mulch from Amazon, so your rescue team stays happy, hydrated, and blooming beautifully. It’s best not to fertilize during the hottest part of summer, unless a plant is showing signs it lacks nutrition, such as yellow leaves. Revamping the yard now will carry it through summer into fall so it keeps looking lush and lovely.

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