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Enthusiast
Join Date: Feb-2005
Location: Carlsbad, California..coastal desert
Country: United States
Posts: 5,433
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Can't help you with your basic question, but from the picture it looks like the wooden bottom slats are too close together. If you leave a little gap and cover it with mesh, you will have excellent drainage, which is one of the best points about using growing boxes. 
Joanie |