What “drought-tolerant” really means
A drought-tolerant tree is one that can get by on much less water than most once its roots have spread into the surrounding soil. It does not mean the tree needs no water at all. Young trees of every species depend on regular watering for their first few growing seasons, and even tough species can struggle through an extreme heat wave.
Heat and dryness also arrive in different forms. A desert garden with alkaline soil and almost no summer rain is a different challenge from a hot, humid region with sandy soil that dries out quickly between storms. Check which describes your site before you pick a species.
Traits that help trees handle heat and dryness
Trees that cope well with dry, hot conditions often share a few features:
- Deep or wide-ranging roots that reach moisture other plants cannot.
- Small, waxy, silvery or divided leaves that lose less water.
- Early leaf drop or dormancy in the driest part of the year.
- Native origin in a similar climate, which usually means the tree is already adapted to local soil and rainfall.
Native trees are generally a good starting point. A local nursery, county extension office or state forestry service can tell you which species perform well in your area.
Drought-tolerant trees worth considering
Hardiness zones and size vary by cultivar, so confirm the details for the variety you buy.
Shade trees
- Bur oak (Quercus macrocarpa): A large, long-lived native with deep roots, often recommended for dry prairie and urban sites. It needs plenty of room.
- Chinese pistache (Pistacia chinensis): A medium-sized shade tree known for orange to red fall color and a good record in hot, dry areas.
- Honey mesquite (Prosopis glandulosa) and velvet mesquite (Prosopis velutina): Deep-rooted desert natives that give filtered shade. Check local guidance, since mesquites can spread in some regions.
- Live oak (Quercus virginiana): An evergreen to semi-evergreen oak for warm regions that handles heat and periods of dry weather once established. For live oak, see the oak tree growing zones guide.
Flowering and ornamental trees
- Desert willow (Chilopsis linearis): A small desert native with showy trumpet-shaped flowers that hummingbirds visit. Despite the name, it is not a true willow.
- Blue palo verde (Parkinsonia florida): A desert native with green-tinted bark and yellow spring flowers. It tends to be short-lived in some gardens, so plan accordingly.
- Crape myrtle (Lagerstroemia): Widely grown in hot summers and tolerant of dry spells once settled in. Choose a size suited to your space, because the mature height varies a lot between cultivars.
Evergreens and small trees
- Olive (Olea europaea): Suited to hot, dry summers and mild winters. Fruiting varieties can make a mess, so some gardeners choose fruitless cultivars. See the olive tree guide.
- Eastern red cedar (Juniperus virginiana): A tough native conifer that tolerates poor, dry soil and works as a screen or windbreak.
Choosing by site
- Soil: Fast-draining sandy soil and heavy clay hold water differently. Dig a test hole and watch how quickly it drains. If water lingers, see our guide to trees for waterlogged and wet soil instead.
- Space: Match the mature size to the spot, including overhead wires and distance from buildings.
- Wind: Hot, dry areas are often windy too. A species with a sturdy structure may suit you better, as covered in our article on the strongest trees against high winds.
- Exposure: Reflected heat from a south or west wall can stress trees, especially young ones.
Getting a tree through its first years
How you plant and water matters as much as which tree you choose.
- Plant at the right depth. The root flare, where the trunk widens at the base, should sit at or slightly above ground level.
- Water deeply and less often. A slow, deep soak encourages roots to grow downward. Frequent shallow sprinkling keeps roots near the surface.
- Mulch. A layer of wood chips a few inches deep over the root zone helps slow evaporation. Keep it a hand’s width away from the trunk.
- Taper off gradually. After the first few seasons, reduce irrigation as the tree establishes, but watch for signs of stress in prolonged heat.
- Plant in the right season. In many hot climates, autumn or early spring planting gives roots time to grow before peak summer heat.
The 10/20/30 rule and diversity
The 10/20/30 rule is a guideline some urban foresters use for planning plantings. It suggests that no more than about 10 percent of trees should be one species, 20 percent one genus, and 30 percent one family. The aim is to avoid losing a large share of your trees to a single pest or disease. For one yard, the takeaway is simple: mix species rather than planting a single type, and see our guide to disease-resistant trees for ideas.
Common mistakes
- Choosing a tree because it is called “drought-tolerant” and then never watering it while young.
- Planting too deeply, which can suffocate roots.
- Fertilizing heavily to force growth in hot weather.
- Ignoring mature size.
FAQ
What is the most drought-tolerant tree?
There is no single answer, because it depends on your region. Desert natives such as mesquite and palo verde are among those adapted to very dry conditions, while bur oak and Chinese pistache are often suggested for hotter inland areas with some rainfall.
What trees do well in hot sun?
Many of the species above do, including crape myrtle, live oak, olive and desert willow. Full sun is generally what they prefer, but young trees still need protective watering.
Do drought-tolerant trees need watering?
Yes, in their first years. Once established, many need only occasional deep watering during long dry spells.