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Drainage and soil for patio beds


We've built two simple redwood boxes (2' x 4' x 8", with a sheet of   
plywood on the bottom) to do a little square foot gardening on our small   
concrete patio.  I was planning to drill some holes in the plywood and   
elevate the box on some 2x4s for drainage.  However, I've read that the   
soil tends to dry out in containers and needs to be watered more   
frequently, so I was wondering if it would actually be better not to   
drill holes in the bottom.  Any thoughts on this?  If holes are a good   
idea, how many and how large holes would you recommend?

Also, we've been planning to use Mel's 1981 container soil recipe (1 pail   
each vermiculite, peat moss, compost, and topsoil, 1 cup lime, 2 cups   
fertilizer, 1/2 pail charcoal) to fill these beds.  I noticed yesterday's   
soil recipe discussion with interest: any other (perhaps more economical   
than vermiculite) suggestions for container soil for beds like this?

Thanks!

 -- Andy


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