weird grey soil...please help!
I was out working in the garden today. I have one very neglected bed that I haven't had the energy to tackle and I finally did today. Well, I started pulling out weeds and as I did I noticed a weird grey soil. It was in large patches. It was stuck to the roots too. I had onions in the bed and I pulled them all out because I had no idea what the grey stuff was. I also noticed a few mushrooms growing in between the large weeds/marigolds/onions. Can someone please help me out on this? I am not sure if I should post here or in the veggie garden section. Also, the only thing I can think of is that there were some feral cats that used to hang out around my house and I would see one in that bed hiding sometimes, so it made me wonder if possibly the cat had used it as a restroom and that was the evidence?