The Q&A Archives: Fungus Growth In Mulch

Question: There are several mushy patches in a newly mulched area under a stand of mature sweetgum trees. A fresh, bright yellow, 6-8 in. patch seems to appear from nowhere each morning, expands to 10-12 in. and over the course of a day dries out and turns a crusty reddish-brown. About 6 patches have appeared in as many days. The mulched area is approx. 25 ft. x 10 ft. and gets a good deal of sun. If they are a type of fungus how can they be eliminated?

Answer: Fungus (and its fruiting process)is a natural part of the decay cycle and is not a danger to your plants, so it is usually only a concern in that it is in some respects a bit ugly. Once the spring rainy season ends and the mulch dries out more, it should lessen on its own. In the meantime, if the surface growth is too annoying you can simply remove it and put it in the trash or somewhere else in the yard away from the mulch.

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