Short answer
It depends on whether you mean a lawn or an ornamental planting. For lawns, tall fescue is the usual drought-tolerant choice in cooler regions, and Bermuda grass or zoysia in warm regions. For gardens and borders, native bunchgrasses such as little bluestem, sideoats grama and prairie dropseed are well known for tolerating full sun and dry soil once established. Switchgrass is a useful all-rounder that copes with both dry and wet conditions.
Lawn grasses for drought and full sun
Cool-season: tall fescue
Tall fescue is a cool-season grass often recommended where summers are dry. Seed companies and extension sources both describe it as having good drought and heat tolerance, thanks largely to a deep root system. Iowa State Extension notes it has excellent wear resistance and good drought and heat tolerance, though it is a bunch-type grass that recovers slowly from damage. Modern turf-type cultivars are finer-textured than older types. It grows in full sun and tolerates some shade.
Warm-season: Bermuda and zoysia
In warmer regions, warm-season grasses developed in hot, dry climates tend to handle drought best:
- Bermuda grass is often called the benchmark for drought resistance among warm-season lawns. It does best in full sun and handles heavy foot traffic, but it turns brown in winter in many areas and does not tolerate much shade.
- Zoysia generally needs less water than St. Augustine and gives a dense lawn, although it also browns in cooler months.
- St. Augustine tolerates part shade but needs more water than Bermuda or zoysia.
Grasses to be cautious with
Kentucky bluegrass is popular but has shallow roots, a high water demand in summer and a tendency to go dormant in hot weather, according to Iowa State. Perennial ryegrass establishes quickly and likes full sun, but it is not especially drought tolerant. Fine fescues have fair drought tolerance but are better known as shade grasses.
Which lawn grass is best depends heavily on your region, so check with your local extension service or an independent garden centre.
Ornamental grasses for drought and full sun
If you are planting a border, meadow or slope rather than a lawn, many ornamental grasses thrive in hot, sunny, dry conditions (our guide to drought-tolerant ornamental grasses goes further). Well-known examples include:
- Little bluestem (Schizachyrium scoparium): upright, blue-green foliage that turns coppery in autumn. See little bluestem varieties.
- Sideoats grama (Bouteloua curtipendula): a drought-tolerant native bunchgrass.
- Big bluestem (Andropogon gerardii): tall and deep-rooted, listed by the RHS for dry, sunny sites.
- Prairie dropseed (Sporobolus heterolepis): a fine-textured clump grass.
- Blue oat grass (Helictotrichon sempervirens) and blue fescue (Festuca glauca): blue-toned grasses that like sun and good drainage.
- Pink muhly grass (Muhlenbergia capillaris): grown for its airy pink autumn plumes where climate suits. See how to grow pink muhly grass.
- Switchgrass (Panicum virgatum): tolerates both drought and wet conditions once established.
Several of these are native prairie grasses that develop deep roots over time. That deep rooting is also why they are used on slopes and banks for erosion control.
What “drought tolerant” really means
A few points help set expectations:
- Tolerant is not the same as maintenance-free. Most drought-tolerant grasses still need regular watering during their first season while the roots establish.
- Dormancy is normal. Some grasses brown off during dry spells and recover when water returns. Bermuda grass, for example, can green up again after rain. That is survival, not necessarily failure.
- Soil and drainage matter. Blue-toned grasses in particular often struggle in heavy, wet soil.
- Look for signs of stress. Leaf blades that curl or fold, a bluish-grey tint or footprints that stay visible in a lawn can indicate it needs water.
Sites that swing between wet and dry
Many real gardens are not consistently dry or consistently wet. Heavy soil can be soggy in spring and cracked and dry by August, and the upper edge of a rain garden may flood briefly and then bake. Grasses that handle both extremes, such as switchgrass and some native bunchgrasses, are useful here. See ornamental grasses that thrive in heavy clay soil for clay-specific advice, and best grasses for rain gardens for plants that suit the dry edge of a basin. For truly boggy ground, a different plant list applies; see ornamental grasses for wet areas.