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Old 06-21-2008, 11:09 AM   #2 (permalink)
Richard
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Location: NW San Diego, CA
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Name: Richard
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Default Re: Rocky, clay soil

Drainage is the key. Dig a test hole at least a foot deep and fill it with water. If it does not drain completely in 2 hours, you need to either: dig a French drain away from the hole to a downhill location, or build a raised bed.

A French drain is a trench about 2-3 inches wide and at the planting hole as deep as the hole. The bottom few inches are 1/2 inch or 3/8 inch gravel, topped with an inch of organic material and then refilled with native soil. It is dug on a downhill slope but does not descend as rapidly so that eventually it exits at the original soil level.

Figure out what you need and then let's talk about filling your hole or raised bed.
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