Mona, I believe the reason Fred does his beds off the ground for the most part is tree roots. It's also easier to weed and such since we have weed problems all year round. If I could do all of mine that way with bottoms I would. At my old place, the 2 beds I had in the hybridizing area had the bottoms and were off the ground. The ones now are just the wood frames with ground cover underneath.
