<p><strong>Noun</strong></p><ul><li>A covering, as of straw, compost, or plastic sheeting, spread on the ground around plants to prevent excessive evaporation or erosion, enrich the soil, inhibit weed growth, etc.</li><li>A person, insect, etc., that fertilizes an animal or plant: Bees are fertilizers of flowers.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) To cover with mulch.</li></ul>