Raised bed over concrete, what for a bottom?
If you want to put a raised bed over a concrete path, do you need to have a wooden bottom or can you staple that landscaper cloth inside to the bottom of the box to hold in the soil better?
My husband made me square boxes with a wood bottom and drainage holes drilled in. It worked fine last year. This year I am considering purchasing some raised beds but there is no bottom. I go for a minimum of 12 inches deep with all my boxes.