I've read that keeping about 8" of mulch on a garden area naturally enriches the soil in a decent amount of time. Ruth Stout wrote a book called No Work Gardening which goes into this. You put manure and any nutrients the soil needs on and just pile on the straw. Everything breaks down over time and the soil gets really nice. I recently read a book on biointensive gardening where double-digging is suggested. It appears to require a ton of work. Naturally, the mulching method holds more appeal. Can anyone here tell me if the double-digging method is smarter to use than the mulching? And if so, why? I assume it must be better or else, why would anyone choose that method over one that is easier?