Hard White Cauliflower-like Growth in Lawn #851382

Asked September 27, 2023, 10:57 AM EDT

I found several areas just under my grass where there is hard white growth; eventually it starts growing up through the grass. It feels almost like concrete when you step in it. The pieces of it can be sectioned off, like cauliflower. I’ve had to dig it out, leaving 1-2” deep areas - usually much larger in area than I photographed. Can you identify what it is and how to treat it? Thank you!

Anne Arundel County Maryland

Expert Response


It appears to be a type of turf mushroom. If you have a tree removed and the roots are still in that area, typically that is the cause for the fungal growth, on the decaying matter under the surface of the lawn. Even if the tree was removed before your presence there, it can take a number of years for the roots to breakdown under the surface. 

There isn't a treatment that is warranted as the mushrooms will re-grow until the roots are decomposed. While these fungal growths are technically not 'fairy -rings' you can try the management techniques described on the webpage to attempt to have them dissipate. Hand removal of them is fine, and trying to establish a thick turf by aerating compacted areas and overseeding in the fall are the best steps you can take to have healthy turf grass. 

Let us know if you have further questions. 


Emily Porter Replied September 27, 2023, 12:44 PM EDT

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