All plants need some water, but drought-tolerant plants have special features — like deep roots, waxy leaves, and the ability to store water — that help them survive with little moisture. This makes them perfect for low-maintenance gardens or landscapes in arid climates.
Drought-tolerant plants save water, money, and keep your garden looking beautiful even when the weather isn’t cooperating.
In this guide, you’ll learn what gives these hardy plants their edge, including their roots, leaves, and even cells adaptations to stay strong in dry conditions.
If you want help picking the right plants for your garden, LawnLove can connect you with a local gardening expert to guide you in making the best choices.
Root systems
Roots do more than anchor plants; they help find and hold water. Drought-tolerant plants have root systems that let them survive with little moisture. Some grow deep taproots to reach underground water. Others spread roots wide near the surface to quickly absorb rain. Some even have root structures that store water for later use.
Deep-reaching taproots
Some drought-tolerant plants grow a strong, central root that pushes deep into the soil. This is called a taproot. It allows the plant to reach water far below the surface. Brittnay Haag, a horticulture educator at the University of Illinois Extension, notes that “With deep, well-developed root systems, these plants source water from deeper in the soil, which is beneficial during dry conditions.”
Read more: 9 Best Drought-Tolerant Annuals
Extensive lateral root system
Many drought-tolerant plants develop wide, shallow lateral roots that quickly absorb moisture from light rain, irrigation, or dew before it evaporates. Often, these plants have both types of roots, a deep taproot and a shallow lateral root system. Researchers say this kind of root architecture, combining deep and lateral roots, is a major reason some plants thrive during droughts.
As Mikaela Boley, master gardener coordinator at the University of Maryland’s College of Agriculture & Natural Resources, points out, plants with dense, fibrous root systems, like bunch-forming grasses, exemplify this adaptation. She notes that grasses such as poverty oat grass endure drought conditions, stabilize soil, and prevent erosion.
Read more: 11 Best Drought-Tolerant Perennials
Specialized root structures
Some drought-tolerant plants survive dry spells by storing water underground. One way they do this is with bulb-like roots. These are thick, rounded roots that hold onto moisture and nutrients like a built-in backup supply. These storage roots work like a water tank. When it doesn’t rain for a while, the plant can draw on the water stored in its roots to stay alive.
Read more: Drought-Tolerant and Drought-Resistant Grass Alternatives
Leaf adaptations
In drought-tolerant plants, leaves are adapted to retain water and make the most of the water they get. These adaptations come in many forms, from shape and size to surface texture and color. By adjusting how they breathe, reflect sunlight, or store moisture, leaves help the whole plant stay healthy when water is scarce.
Reduced leaf surface
Drought-tolerant plants conserve water by having smaller or narrower leaves. Less leaf area means fewer pores for water to escape from.
According to Michael V. Mickelbart and Matthew A. Jenks at Purdue University Extension, “Plants have a number of ways to reduce water loss that occurs through transpiration. One is to simply reduce leaf area. When water stress is an issue, large leaf areas can be detrimental to growth and survival because there is more surface area from which water can be lost.”
Read more: 9 Best Drought-Tolerant Ground Covers
Waxy or reflective coatings
Many drought-tolerant plants have a waxy or reflective coating on their leaves. This coating, often appearing as a shiny or bluish layer, acts like a natural sunscreen, reflecting sunlight and reducing water loss.
“Leaf wax creates a boundary between the plant leaf and the atmosphere and reflects the plant’s adaptation and response to environmental stresses, including drought,” explains Xuejun Dong, research crop physiologist at the Texas A&M AgriLife Research.
Read more: 9 Best Drought-Tolerant Shrubs
Fuzzy or hairy leaf surfaces
Some drought-tolerant plants have tiny hairs, or trichomes, on their leaves, giving them a soft, fuzzy look. These hairs help trap moisture near the leaf surface and reflect sunlight, reducing water loss.
Mickelbart and Jenks explain that “While we still don’t fully understand how leaf hairs affect plant water loss, leaves that are covered with these small hairs typically lose less water than those that do not.”
Read more: 9 Best Drought-Tolerant Ornamental Grasses
Leaf dropping
To conserve water, some drought-tolerant plants shed their leaves during dry spells. This process helps reduce water loss by limiting evaporation from the leaf surface, a process called transpiration.
Laura Lukes, master gardener at the University of California, Agriculture and Natural Resources, notes that “A good example of this is the buckeye shrub (Aesculus), which is one of the first plants to lose its leaves before summer heat and drought.”
Read more: 10 Best Drought-Tolerant Trees
Cellular adaptations
Inside drought-tolerant plants, cells are specially adapted to store water, regulate moisture movement, and control water loss. These microscopic adjustments help the plant stay hydrated, protect its tissues, and continue functioning even when water is scarce.
Specialized water-storing cells
Some drought-tolerant plants, like succulents, have specialized cells in their leaves, stems, or roots that store water during wet periods. Researchers say these cells allow plants to stay hydrated and keep functioning when water is scarce.
Read more: 10 Best Drought-Tolerant Fruits
Adjusted osmotic pressure
During a drought, some plants use osmotic adjustment to stay hydrated. Robert Sharp at the University of Missouri Extension explains this process as the accumulation of certain substances, like sugar and amino acids, within their cells. By increasing the concentration of these solutes, the plant can pull water back into the cell to maintain moisture.
Read more: 9 Best Drought-Tolerant Vegetables
Efficient stomata control
Stomata are tiny leaf openings that let plants exchange gases, but they also allow water to escape. Drought-tolerant plants can regulate their stomata, closing them to conserve water, reduce transpiration, and prevent dehydration. By controlling stomatal openings, these plants balance the need for carbon dioxide intake with the necessity of conserving water.
Read more:
- Best Drought-Tolerant Grasses
- 8 Signs of a Drought-Stressed Lawn
- How to Prepare Your Lawn for Drought
- How to Help Your Lawn Recover from Drought
FAQs about drought-tolerant plants
Some of the benefits of planting drought-tolerant plants are that they reduce water usage, which is great in areas with water restrictions or drought seasons. These plants are also low maintenance. Many resist pests and diseases.
Not all cacti and succulents are equally drought-tolerant. While most are adapted to dry conditions, their tolerance can vary depending on the species, climate, and soil they’re grown in.
Many drought-tolerant plants can stay green during dry periods. However, some may slow their growth, turn slightly duller, or drop leaves to conserve water. These changes are normal survival strategies and don’t mean the plant is unhealthy.
Contact an expert to build a resilient landscape
Choosing drought-tolerant plants is a sustainable way to create a beautiful garden even when water is limited. If you’re unsure where to start or need help selecting the best plants for your yard, LawnLove can connect you with a local garden expert to help you design a water-wise garden.
Sources:
- Mikaela Boley, Master Gardener Coordinator. College of Agriculture & Natural Resources. University of Maryland. Personal Interview.
- “Build drought-tolerant gardens this fall for next summer’s blooms.” By Brittnay Haag. Horticulture educator. University of Illinois Extension.
- “The crucial role of lateral root angle in enhancing drought resilience in cotton.” Frontiers in Plant Science.
- “Drought-tolerant Plants.” By Michael V. Mickelbart, horticulture and landscape architecture, and
- Matthew A. Jenks, USDA Arid-Land Agricultural Research Center, Maricopa, Arizona. Purdue University Extension.
- “What Makes a Plant Drought Tolerant?” By Laura Lukes, UC Master Gardener. University of California, Agriculture and Natural Resources.
- “Warm Climate Production Guidelines for Succulents.” By Rick Schoellhorn, Marc Frank. University of Florida’s IFAS Extension.
- “Plant roots under drought – no longer the hidden half.” By Robert Sharp, Chancellor’s Professor and Curators’ Distinguished Professor Emeritus. University of Missouri Extension.
Main Image: Close-up of lamb’s ear plant. Image Credit: Peter Burka / Flickr / CC BY-SA 2.0
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