Thanks to sage advice here (Jeff Lowenfell's books), I am going back to soil. I couldn't put them down. Gotta get a microscope ha! fascinating stuff Now I have 4 useless 2x4 foot tubs, 2 about a foot deep and the other two, half that. I'm thrilled that I can re-use the earth but I'm going overboard again and want to use the 2 larger tubs instead of pots. A no till thing, I'm thinking Jeff's web would take over the whole tub and I plant and remove plants as necessary.... even chopping males won't be so painful as the roots stay. maybe a mulch? still reading. I'd have to cut more drainage holes (which hacks their hydro use but I doubt I could sell them) I also thought I could use some hydroton along the bottom and perhaps a screen (landscape cloth?) then the soil. Seems too simple.