I've been using bags and bags of pine bark fines this season, but the pot with the mushrooms is from a season when all I had access to was nuggets. There are many pots with the exact same mix from that season, only this one has the 'shrooms. I'm using RootBuilder pots, this particular pots has mushrooms growing out of holes midway down the pot, as well. The Sweet Tart tree seems happy, but now I have new types of fungus growing in it. I'm hoping we get some relief from the rain here, we've been getting an almost-daily downpour for weeks.