
LOVESalem HQ just got new hardiplank cement siding affixed with honking big spikes fired into firring strips that are spiked to the cinderblocks, so that will probably support a TON of these, with drip lines run up to and across each "bed" (gutter) to for all kinds of smallish things that will love the heat reflected off the insulated wall.
And this has gotta be great accessible gardening for older/disabled people who can't garden at ground level or in low raised beds.
This is one of those palm-in-forehead "Why didn't I think of that!" things . . .