Outside one of our halls of residence, on campus: these tall planters, with lots of herbs, arugula, lambs' lettuce etc. sprouting out of them. I'd love to possess a whole forest of these ... I'm not sure whether an enterprising USC gardener took, drilled, and mounted some PVC pipes, or whether one can buy this exact type (a quick Google didn't produce any obvious sources - certainly not at this height - but I'm sure they exist). And they would be gopher proof!