Mulch is applied to landscaping and gardens to help plants thrive. It keeps weeds at bay, helps soil retain moisture and helps soil maintain even temperatures. When mulch decomposes, it adds valuable organic nutrients to the soil. However, sometimes mulch can develop mold, inhibiting plant growth and causing plant death. Unfortunately, other than getting rid of the mulch and starting over, it can be difficult to remove mold completely. But by following a few simple guidelines, you can help remove mold from your mulch and keep it under control.
Remove all but 2 inches of mulch. In general, it is best not to have more than 2 inches of mulch in order to keep mold and other fungi from forming.
Turn over the mulch and chop it with a spade to speed up the process in which the mulch turns into soil.
Soak the mulch with water to encourage other bacteria that compete with mold to grow. Move the wet mulch into a pile, and let the sun heat it up. The mulch should reach temperatures between 110 to 140 degrees F.
Return the mulch to its original location in the fall. When the mulch suddenly drops in temperature after being moved, the mold should die.