What does mulch mean?
Mulch is a material spread over soil to help plants and the ground beneath them. It may consist of compost, bark, wood chips, leaves, straw, grass clippings, or another suitable covering. Mulching can reduce evaporation, moderate soil temperature, limit weed growth, and gradually add organic matter to the ground. The word is also used as a verb: to mulch a garden, flower bed, or tree means to apply such a covering. In everyday gardening and landscaping, mulch is usually associated with improving growing conditions and maintaining tidy beds. In agriculture and horticulture, the term can also refer more broadly to materials used to cover or protect the soil. Although mulch is sometimes confused with fertilizer, the two serve different purposes: mulch primarily covers and protects the soil, whereas fertilizer supplies nutrients to plants.
A layer of material spread over soil to retain moisture, suppress weeds, protect plants, or improve the ground.
"A layer of straw mulch kept the vegetable bed moist during the dry spell."
Usually uncountable when referring to the material in bulk; “mulches” can refer to separate coverings.
To cover soil or the base of a plant with mulch.
"They mulched the shrubs with shredded bark."
Common in gardening, landscaping, and agricultural contexts.
Usually the material is treated as uncountable, but “mulches” is used when referring to distinct coverings or individual applications.
"Different mulches provide varying degrees of weed suppression and moisture retention."
Mulch does more than decorate a garden: it acts as a protective blanket for soil, helping roots stay cool and damp while weeds struggle to grow.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does mulch come from?
The word mulch is recorded in English from the early 17th century, with the noun developing from earlier verb uses associated with making something moist or soft. Its precise historical development is somewhat uncertain, and it may be related to words in the same semantic family involving moist, soft, or decaying organic material. The modern agricultural meanings eventually became established for both the covering material and the act of applying it.
Related word forms
How mulch is actually used
The noun is commonly used as an uncountable collective term for the material itself, although “mulches” is used when referring to separate coverings. The verb is standard in gardening, landscaping, and agriculture.