I always put newspaper down to keep the weeds out. I use 3 stacked 4x4 landscape timbers. My bed is 3' x 20' along the side of my backyard fence. Usually plant one row of tomatoes and offset peppers, eggplant, cucumbers go along the fenceline. Also have 2 separate 3'x3' herb gardens that also have landscape timbers. They seem to work well for me.
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