A drought-tolerant plant can survive periods of limited rainfall better than a plant that prefers consistently moist soil. Some develop deep roots, while others have silvery foliage, small leaves, waxy surfaces, or succulent growth that helps reduce moisture loss.

However, those natural adaptations are most useful after the roots have grown into the surrounding soil.

A plant that was recently removed from a nursery container still has most of its roots packed into a small root ball. Until those roots begin spreading outward, the plant can dry out much more quickly than an established perennial growing beside it.

This is why planting in spring matters. It gives your plants a head start before July and August bring higher temperatures, stronger sunlight, and less predictable rainfall.

Some perennials may take several growing seasons to reach their fullest, most established appearance, even though they will begin settling into the garden during their first year.

You may have heard that perennials should never be planted during summer, but that is not entirely true. Container-grown plants can be added to the garden throughout the growing season as long as the ground is workable and you are prepared to provide extra care. The challenge is that summer heat increases stress and causes both the root ball and surrounding soil to dry more quickly. New plants may need frequent monitoring, deep watering, and temporary protection during periods of extreme heat. Whenever possible, plant during a cooler stretch of weather, work in the morning or evening, and avoid planting immediately before a vacation. Summer planting can be successful, but spring planting gives drought-tolerant plants more time to establish roots before they face their most demanding conditions.

These drought-tolerant plants for Zone 7 provide a mix of flowers, foliage, fragrance, texture, and pollinator value. Most prefer full sun and good drainage, making them especially useful in hot borders, cottage gardens, curbside beds, slopes, and other areas where moisture disappears quickly.

Botanical name: Achillea millefolium
Light: Full sun
Typical height: 1 to 3 feet
Best feature: Long-lasting flower clusters and fern-like foliage

Yarrow is one of the most dependable choices for a dry, sunny garden. Its flat flower clusters are available in shades of white, yellow, pink, peach, red, and terracotta, depending on the variety.

Once established, yarrow tolerates drought, poor soil, and dry conditions. In fact, overly rich or consistently wet soil may cause plants to grow too tall and flop. Good drainage and plenty of sunlight usually create a stronger, more compact plant.

Yarrow is also useful for pollinator gardens, cottage-style borders, and cut flower arrangements. Remove faded blooms to keep the plant tidy and encourage additional flowering.

Why we love it: Yarrow looks delicate, but it is surprisingly tough once its roots are established.

Botanical name: Nepeta x faassenii
Light: Full sun to partial shade
Typical height: 1 to 2 feet, depending on the variety
Best feature: Long-lasting blue-purple flowers

Catmint is an excellent option for gardeners who want a soft, cottage-garden look without adding a demanding plant. Its gray-green foliage forms a spreading mound, while blue-purple flowers create color from late spring into summer.

Once established, catmint is drought tolerant and grows well in dry, rocky, or well-drained soil. Cutting it back after its first major flush of flowers can encourage fresh foliage and another round of blooms.

Compact varieties work especially well along walkways, at the front of garden beds, or around roses and other flowering shrubs.

Why we love it: Catmint provides months of color and movement while remaining relatively easy to maintain.

Botanical name: Yucca filamentosa
Light: Full sun to partial shade
Typical size: Approximately 2 to 3 feet of foliage, with taller flower stalks
Best feature: Bold evergreen structure

Yucca brings an architectural element to the garden with its pointed, evergreen foliage and tall stalks of creamy white flowers.

Adam’s Needle yucca is hardy throughout Zone 7 and tolerates dry, rocky, and low-fertility soil once established. It performs best where excess water can drain away from its roots.

Use yucca as an accent plant, in a hot curbside bed, along a dry slope, or in an area where other plants tend to struggle. Just be sure to give its pointed foliage enough space away from narrow walkways.

Why we love it: Yucca provides year-round structure and looks right at home during the hottest part of summer.

Botanical name: Stachys byzantina
Light: Full sun to partial shade
Typical height: 6 to 18 inches
Best feature: Soft, silvery foliage

Lamb’s ear is known for its fuzzy silver leaves, which add contrast to green foliage and colorful flowers. The silvery surface also helps the plant handle sunny, dry conditions.

It is moderately drought tolerant once established and grows best in dry to medium, very well-drained soil. Lamb’s ear does not enjoy constantly wet leaves or soggy soil, particularly during humid summers. Some afternoon shade can be helpful in especially hot locations.

Plant it near catmint, yarrow, lavender, or purple coneflower for an easy cottage-garden combination.

Why we love it: The foliage remains attractive even when the plant is not blooming.

Botanical name: Coreopsis verticillata
Light: Full sun
Typical height: 1 to 3 feet, depending on the variety
Best feature: Cheerful daisy-like flowers

Coreopsis brings bright, cheerful color to sunny garden beds. Threadleaf varieties have fine-textured foliage and masses of yellow, daisy-like flowers from late spring through summer.

This perennial grows well in dry to medium, well-drained soil and tolerates heat, humidity, drought, and poorer soil conditions. Shearing the plant after its first major bloom can encourage a tidier shape and additional fall flowers. Popular varieties include ‘Moonbeam’ and ‘Zagreb.’

Why we love it: Coreopsis gives you the classic look of a summer daisy with better tolerance for hot, dry conditions.

Botanical name: Leucanthemum x superbum
Light: Full sun
Typical height: 2 to 3 feet
Best feature: Classic white flowers with yellow centers

Shasta daisies provide the traditional summer flower look that works beautifully in cottage gardens and cutting gardens. They bloom throughout summer and attract butterflies.

Shasta daisies tolerate dry to medium soil and some drought once established, but drainage is essential. They are not quite as rugged as yucca, yarrow, or sedum during prolonged dryness, so they may need supplemental water sooner during an extended heat wave. Removing faded flowers encourages additional blooming.

Plant them where they can receive good air circulation and where you can reach them with a hose when summer conditions become especially dry.

Why we love it: They provide timeless summer color and pair easily with almost any other perennial.

Botanical name: Rudbeckia fulgida
Light: Full sun
Typical height: 2 to 3 feet
Best feature: Golden-yellow flowers and a long bloom season

Black-eyed Susans are another excellent choice for gardeners who love daisy-shaped flowers. Their golden petals and dark centers create dependable color during the hottest part of the growing season.

These perennials tolerate hot, humid summers and become drought tolerant once established. They are adaptable to a range of soils as long as the area does not remain soggy. Plants may spread gradually to form larger clumps, making them useful for filling sunny borders.

Why we love it: Black-eyed Susans bring reliable midsummer color when many spring bloomers have finished.

Botanical name: Echinacea purpurea
Light: Full sun to partial shade
Typical height: 2 to 4 feet
Best feature: Pollinator-friendly summer flowers

Coneflowers are a staple of sunny perennial gardens for good reason. They produce sturdy, upright flowers in shades of pink, purple, white, orange, yellow, and red, depending on the variety.

Purple coneflower is drought tolerant once established and also handles summer heat and humidity. It adapts to several soil types but performs best when the soil drains well.

Leave some seed heads standing at the end of the season to provide winter interest and a food source for birds.

Why we love it: Coneflowers combine bold summer color, pollinator value, and strong garden performance.

Botanical name: Hylotelephium species and cultivars
Light: Full sun
Typical height: 1 to 2 feet
Best feature: Succulent foliage and late-season flowers

Upright sedums, often still sold simply as sedum, store water in their thick leaves. This makes them some of the most recognizable drought-tolerant perennials for Zone 7.

Stonecrop handles heat, dry soil, and periods of limited rainfall particularly well. It prefers well-drained soil and may become floppy if planted in overly rich or consistently wet conditions. Varieties such as ‘Autumn Joy’ also provide clusters of late-summer and fall flowers that attract pollinators.

Why we love it: Sedum provides attractive foliage before blooming and keeps the garden interesting into fall.

Botanical name: Salvia yangii
Light: Full sun
Typical height: 2 to 4 feet, depending on the variety
Best feature: Airy blue flowers and silvery foliage

Russian sage produces clouds of lavender-blue flowers above fragrant, silver-green foliage. Its open texture mixes beautifully with coneflower, coreopsis, yarrow, and ornamental grasses.

It performs best in full sun and dry, well-drained soil. Wet or poorly drained conditions should be avoided. Russian sage is hardy in Zone 7 and is a natural fit for drought-tolerant gardens.

Compact varieties are helpful for smaller gardens or areas where traditional Russian sage may become too wide.

Why we love it: It adds height and color without making the garden feel heavy or overcrowded.

English lavender is hardy in Zone 7 and drought tolerant, but it has one very important requirement: excellent drainage.

Lavender often struggles more with wet soil and humid conditions than it does with drought. Plant it in full sun, avoid low areas where water collects, and improve drainage when working with heavy soil. Raised beds, slopes, and gravelly planting areas can be particularly useful.

Lavender can be a wonderful low-water garden plant when it is given the right site, but it is less forgiving in wet clay than plants such as coneflower or black-eyed Susan.

The first summer is when gardeners are most likely to misunderstand drought tolerance.

Even plants selected for dry conditions may need regular supplemental water during their first growing season. Watch the soil, rainfall, temperature, wind, and the plant itself rather than following a rigid calendar.

A slow, thorough watering encourages moisture to move farther into the soil. Frequent, shallow sprinkling keeps moisture near the surface and may encourage shallower root growth.

Deep, less frequent watering generally supports a deeper root system and better long-term drought tolerance.

Push your finger into the soil near the root ball. If the soil below the surface still feels cool and damp, the plant may not need additional water yet. If it feels dry several inches down, it is probably time to water.

This is especially important in clay soil, which may appear dry on top while remaining wet underneath.

New plants may need additional water when temperatures remain unusually high, even when they are considered heat or drought tolerant.

An established sedum or yucca may handle a dry week with little trouble. A newly planted one still has a limited root system and may dry out much faster.

A light layer of mulch helps reduce moisture loss, moderate soil temperatures, and limit weed competition. Keep mulch away from the crown and stems of the plant rather than piling it directly on top.

Many plants on this list are sensitive to poor drainage. Lavender, lamb’s ear, yucca, sedum, coreopsis, and Russian sage can struggle when their roots remain constantly wet.

The goal is not permanently damp soil. The goal is a thorough watering followed by time for the soil to begin drying.

A drought-tolerant garden can make travel easier, but a little preparation still goes a long way.

Before leaving:

• Check the forecast and recent rainfall.
• Water new plants deeply if the soil is dry.
• Pull weeds that would compete for moisture.
• Refresh thin mulch around newly planted perennials.
• Move small containers out of intense afternoon sun.
• Ask someone to check recent plantings during prolonged heat.
• Prioritize new plants, containers, and moisture-loving plants when arranging watering help.

Containers require more attention than in-ground gardens. Even drought-tolerant plants can dry quickly when their roots are confined to a pot. During hot, dry weather, some containers may need water every day or even more than once per day.

For a truly lower-maintenance vacation garden, place your toughest plants in the ground and reserve containers for areas where regular watering is manageable.

The best time to think about your summer watering routine is not the night before you leave for vacation. It is during spring planting season.

By selecting drought-tolerant plants for Zone 7 and planting them before the most intense summer weather arrives, you give them time to begin growing roots into the surrounding soil. Continue checking and watering them throughout their first summer, especially during heat waves or long periods without rain.

Over time, plants such as yarrow, catmint, yucca, lamb’s ear, coreopsis, black-eyed Susan, coneflower, sedum, and Russian sage can create a colorful garden that asks for less frequent attention.

That does not mean a completely water-free landscape. It means a garden designed to recover more easily from hot afternoons, busy weeks, and the occasional summer getaway.

Visit Bast Brothers Garden Center to explore drought-tolerant perennials for your sunny garden, or check our online availability before your visit. Our team can help you choose plants based on your sunlight, soil, available space, and maintenance goals.

Plant early, water thoughtfully, and give your garden the strong start it needs before summer arrives.