Convoluted story… there were these 2x2 “kits” for the urban gardening on sale. Basically a plastic tub with some bottom-watering system that drains overflow. Hacked two together and put in these planters that were also on sale. Worked out well, except I suspect there’s leaking through my seams, so top watering this time around (rendering whole system sorta pointless, sigh) and having promising results