gregpresley wrote:
What are you planning to raise in that bed? I made a raised bed on a on old
asphalt driveway in back that was unused, had some thick uneven blocks to
hold in the dirt and put in about 1 foot deep or less of soil. I have grown
lettuce, collards, tomatoes, parsnips, sugar snaps peas, etc in there. They
have done fine. The soil packs down with time, so I have to add two-four
bags plus manure each spring. If you are planning to grow trees or shrubs,
obviously your bed will need to be deeper, but for vegetables or annual
flowers, you certainly don't need 3 feet of soil. (However you will need to
water in times of drought, more than for your regular beds).


It's going to be a vegetable and herb garden, no trees or shrubs. To be
honest, we mostly thought about 3' because it would be less bending over
when planting or weeding. But I'm not sure if I want to do a lot more
effort in constructing and filling the boxes, just for that .

Thanks for the feedback; as a newbie this is the kind of thing I really
didn't know about.

Kevin