n. [ Cf. mull dirt, also Prov. G. mulsch, molsch, rotten, soft, mellow, as fruit. ] Half-rotten straw, or any similar light, porous, organic substance strewn on the ground, as over the roots of plants, to protect from heat, drought, etc., and to hinder weed growth and preserve moisture. [ 1913 Webster ]

v. t. [ imp. & p. p. Mulched p. pr. & vb. n. Mulching. ] To cover or dress with mulch. [ 1913 Webster ]