Mulching to Conserve Water
Practice
Mulching helps the soil hold moisture by reducing evaporation from the surface. It also moderates soil temperature and can help suppress many weeds that compete for water. Mulch supports watering efficiency, but it does not replace the need to irrigate when soil is dry.
How it works
A layer of organic or inorganic material is placed on top of the soil around plants. This layer shades the soil and slows the direct loss of moisture to sun and wind. It also helps soften the impact of rain or irrigation, which can reduce crusting in some soils. Over time, some mulches can improve soil structure as they break down.
Best for
It works best in vegetable gardens, ornamental beds, around trees and shrubs, and in pathways between plantings. It is especially useful in hot weather, windy sites, and places where the soil surface dries quickly.
Tips
Keep mulch a short distance away from stems and trunks so the base of the plant stays drier and better aired. Recheck soil moisture under the mulch because the surface may look dry while the root zone is still moist. Refresh mulch as needed when it decomposes, shifts, or becomes thin.
General guidance for US gardens. Watering needs vary with soil, climate, and weather. Page updated Aug 4, 2026.