This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Plural form of mulch.

v. Third-person singular simple present indicative form of mulch.

"Chemical fertilizers/pesticides/herbicides facilitate farm operations despite the greater benefits attributable to use of natural treatments such as mulches and manure."

mulched    mulches    mulching   

cover    protection    protective cover    protective covering   

humus    compost   

mulched    mulching    mulch depth    inorganic mulch    organic mulch    mulching mower   

covert   

gulch   

compost    sawdust    fertilizer    loam    manure    mold    insecticide    guano    shaving    sludge