Raised garden bed on asphalt - Knowledgebase Question

Grand Rapids, Mi
Question by jim808
November 19, 2009
There's a group in our church that wants to create a raised bed community garden on an area of our church asphalt parking lot. Placing the raised beds on asphalt appears to me to not be a good idea. What do you think?

Answer from NGA
November 19, 2009


If you can install some perforated PVC pipe in the bottom of the raised bed and guide the PVC pipe out under or through the wood or concrete blocks you use for the sides of the planter, drainage should be fine. Excess water will drain out of the bottom all by itself even if you don't build in some PVC pipe drainage, but it will take a longer time and can cause problems with the roots of the plants. At least with the PVC pipe in place you can somewhat direct the runoff water. A raised bed should be at least 18" high to accommodate the roots of most annuals and perennials. Best wishes with your new raised bed.

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