Sorry to thread-jack, but I've started a bunch of seedlings in smaller tree-pot trays (6-8" deep), and it seems like they aren't really building dense root structures. There will be a tap root but if I try to pull the plant out of the root pot the soil will all crumble away and I'll be left with a bare root. Do I need to fertilize differently, or water from the bottom in a tray, or water more frequently from above with less water? I had considered that the soil mixture may be too dense, so I made sure to prehydrate the peat moss etc before preparing trays.