you are going to have mushrooms pop up from time to time. It's an indication of healthy soil and a natural eco-system.
As far as if they are edible, I wouldn't even try unless you are an expert. I have morel-like mushrooms in spots, but am freaked-out by the notion of eating them. And I like mushrooms.
If you use (or recently used) any chemical fertilizers or weed killers in the area or in an area that drains to your mushroom field I wouldn't consider eating them even if a mushroom expert deemed them edible.
Your mushrooms will decay and die back - nourishing your soil.
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