She makes her own "soil" Old Hawaiian style, by taking the old "soil", layering in organic material (weeds basically), then planting a new crop. By mulching the top, she keeps the plant roots moist and cool. Ya know, it works!
She's solved another problem by using salvaged metal grates...........cats using the soft soil for a catbox. The crops will grow up through the grate with no problem, and the cats are aghast to find themselves thwarted, actually cheated, out of a good place to poo. I plan to help her out by watching for grates at the dump. Or perhaps some other kind of firm mesh, be it plastic or metal. I like her solution a lot. Cool!