In landscape design, weed barrier, also known as landscape fabric or weed control fabric, has historically played a crucial role in maintaining a tidy and low-maintenance outdoor space, and in separating clients from their money.

Mulches shade the soil, keeping plant roots cool in the hot sun, and warmer at night when the air temperature drops. Mulch also helps soil retain water, so that the moisture levels are more even between waterings, and can reduce erosion from water runoff.