I bought a huge bag of soil this fall (not MiracleGrow, it's in a pink/purple bag). I planned to use it for starting seeds. I used some of it to repot my amaryllis and two of the pots had mushrooms growing in them (and they hadn't had water for a couple of weeks)! My question is, can I use it to start seeds inside this spring? Will the seedlings be OK if mushrooms grow in my flats?