Very cool spirally garden bed design! I know what you mean about the bags of leaves. I, too, find it strange that people throw out their leaves and trimmings and then they go out and buy mulch and growing amendments. Hmmm ...(?) I ask my neighbors for all their leaves and stuff, chop 'em up with my lawn mower, and then pile it thick on all my garden beds for the winter. Now they're all full of big, fat, juicy, soil aerating, earth worms. Time to plant!