Hard White Cauliflower-like Growth in Lawn - Ask Extension
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 c...
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 CountyMaryland
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.
This work is supported in part by New Technologies for Ag Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.