Lawn Problems

I Have What I Can Only Describe as Clusters of Black Balls in My Garden

badmummy added on August 31, 2012 | Answered

Recently we have noticed clusters of black balls, about the size of grapes, growing on the grass. What are they?

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Certified GKH Gardening Expert
Answered on August 31, 2012

It could be slime mold. Slime mold takes many forms. The most common forms on grass resemble small purple or black balls attached to blades of grass but you may also see white to yellow‑orange, jelly‑like masses in lawn areas too.

Slime mold, for the most part, is a beneficial organism that decays dead plant material, returning nutrients to the soil. It is not a disease, but grass that has slime mold growth may be more susceptible to turf diseases, especially if humid conditions are common.

Chemical control is usually not necessary. Raking up and disposing of the slime mold is usually all that is required, or it will go away on its own during warm, dry conditions.

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