To get rid of mushrooms in your yard, remove their sources of attraction by increasing air movement in the soil, reducing excess water in the yard, and using fertilizer to decompose the organic matter which often causes mushroom growth. Removing them by hand also works but does not address causes.
- Reduce the amount of water in the yard
Since excess water encourages the growth of some mushroom species, adjust your sprinkler system settings to water the yard less frequently.
- Increase air movement in the soil
Get rid of thatch covering the yard, and use an aerator to add holes to the soil, so that air circulates more freely in the soil. Bring in a professional if you are concerned about using an aerator yourself.
- Fertilize the yard to accelerate decomposition
Apply nitrogen-based fertilizer to speed up the decomposition of organic matter in your yard. Use a rate of 1 pound of nitrogen for each 1,000 square feet in your yard. Purchase nitrogen that releases immediately from the fertilizer rather than water-insoluble or slow-release; one example would be ammonium sulfate (21-0-0).
- Get rid of debris contributing to mushroom growth
Eliminate rotting much, pet waste and old stumps from your yard, as they all have organic material that contributes to mushroom growth. Avoid spraying fungicides on mushrooms, because the mushrooms are merely the fruit of a plant beneath the ground, and the fungicide does not spread to the plant.