H.A.F.
a.k.a. Rusty Nails
I use a worm bin for that purpose so I can keep it inside. And re-using the soil I think it's just being consistent what you add through the grow. It might not be available until next plant, but this one is eating the stuff you put in last timePine is the worst. Turns soil acidic. The best thing for organic guys is to start an outdoor compost pile and just mix it with your soil. Growing in pots there is not enough time to amend soil in a pot by putting stuff on top.