Answer: The mushrooms are growing because there's a food source. Decomposing compost or bark mulch is prime real estate for mushrooms. The mushrooms are harmless to your plants and to your soil. They are quite common and nothing to be concerned about. It just means there's lots of organic matter over your soil or something beneath the soil that is decomposing. Could be old roots, construction debris, or something else that's rotting. You can rake the mushroons out of the garden to remove them. Best wishes with your garden.
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