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Old November 2, 2016   #2
Gardeneer
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Join Date: Feb 2015
Location: NC - zone 8a - heat zone 7
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if you install raised bed on native clay soil , then you would want the bed at least 18" high.
I had made mine 12" but the native soil was not as bad as clay. Then I also loosened it up and amended with pine bark fine before filling the bed.
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