Nuisance mushrooms in lawns are often harmless and not a cause for concern, as they are a natural result of fungi breaking down organic matter in the soil. Most mushrooms are not poisonous, but caution should still be used when handling them. Fairy rings, dark green arcs of grass caused by fungi, can be addressed by applying nitrogen-rich fertilizer to even out grass color. If the fungus has become too dense and is affecting nearby grass, aeration or manual removal may be necessary. Inspecting irrigation systems for leaks and addressing drainage issues can help prevent recurring fungal problems. For more information and assistance, residents of Los Angeles, Orange County, Riverside County, and San Bernardino County can contact their respective Master Gardener programs.
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