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improving soil drainage

"I live in the California central valley where temperatures remain high from June through September. The soil I have to work with is either a heavy, sandy loam or hard pan which is why I have raised beds. My toughest plants (yarrow, gaillardia) don't have trouble with the soil conditions, but sage and agastache are not doing well. All the plants require soil that is ""Well drained and low fertility"". What can I add to the soil to lighten it, improve drainage, and keep it on the lean side.
Submitted by BHGPhotoContest

Compost is your best bet for improving soil drainage while not adding appreciable fertility. You can apply up to 3 inches of compost, and work it into the top 6 inches of soil

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