mushrooms - Knowledgebase Question

hammond, In
Avatar for mlsuski
Question by mlsuski
August 7, 2010
What causes mushrooms in my lawn after I mow it? Also, why are my roots yellow?

Answer from NGA
August 7, 2010
I think the problems are related. Mushroom grow from decomposing organic matter. In this case, they are probably sprouting from dead or dying roots, crowns, and/or stolons on the surface of the soil. The yellowing near the roots of your grass can indicate overwatering which is resulting in dead and dying crowns. There may be a soil compaction problem which is keeping water from draining down into the soil; there may be a thatch build up which is holding too much moisture. If your lawn is 4-5 years old or older, and you have not aerated it, I'd suggest doing so this fall. You'll also want to check for excessive thatch build up. Dig a 6" square of lawn and measure the thatch at the top of the soil. If it is an inch or more thick, it's time to dethatch your lawn. This, too, is a process you'll want to do in the fall or in the spring months. Best wishes with your lawn.

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