Mulching
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You don't have to, but do make sure you don't get too deep of a layer of mulch. You also want to "stir and fluff" the old mulch before putting the new mulch on top.
Keep in mind, the more you add, the more deprived of the proper moisture and sunlight your plants get ..yes mulch decays and becomes almost a natural compost, however it can effect your trees and plants ,and in some cases will cause mold and fungus to grow under layers
Hi Bonnie, The answer is indefinite. You can cultivate the existing mulch before adding the new layer, provided that there is no sign of any fungal disease. Cultivating helps loosen the mulch and allows rain to get into the soil. ... Depending on how much is needed for a new mulch, old mulch must never be removed.