thanks for the rock wool tip!I have a 4 tier light garden in the basement (vintage 1980) which I've retrofitted with modern LED grow lights and a 4 channel programmable WIFI switch to control the lights. It works great, I get 12 full trays in the top 3 tiers, hydro tubs sit on the ground for the 4th level. Works like a charm. I use the hydro setup on the bottom for non stop lettuce and for cloning. Each fall I pull a few of my fave exotics from the garden, clone & keep them alive over the winter. This winter I saved 2 colossal coleus and some prized Reapers. In January I chopped up the mothers and cloned twice now I have about 40 garden ready plants that would have cost $4each. Also layered a sting of passion fruit and mandivilla by placing them along side the garden and running a vine thru sole layring pots. Marginal results, about 1/2 rooted. Kept a few 420s cuttings for monstering, they look promising.
I got one of the little 3 pod Aero gardens for Christmas, they produce like crazy. For fun I did a few toms, they were 6" tall after about 2 weeks and starting to get bushy, I divided them and the Aeropod worked juts as well as a cloner, at least for toms. I don't use the pods -- pretty expensive -- instead I use quartered rockwool cubes stuffed into spent pods - they work like a charm and for about $10 you can refill almost 200 pods.