Answer: The mushroooms are the fruiting bodies of underground fungus. They appear when weather conditions are right, and disappear when conditions change. They feed on decomposing organic material under the soil, often dead tree roots or wood material possibly used at some time as a soil amendment. Once the organic matter is used up, the mushrooms will stop. You can rake them up if they bother you, but they are not harming your plants -- they are just a part of the natural cycle of decay and renewal and ultimately are part of the natural renewal process for the soil. I hope this helps.
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