In one of my containers (and only one, thankfully) I have found a small mushroom growing.

Is this any cause for concern and if yes what do i need to do.
Mr. GreenJeans 800 Reviewed by Mr. GreenJeans 800 on . a mushroom ???? In one of my containers (and only one, thankfully) I have found a small mushroom growing. Is this any cause for concern and if yes what do i need to do. Rating: 5