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From: San Angelo, TX
Region: Southwest
Topic: Compost and Mulch, Shrubs
Title: Chlorosis in yaupon from San Angelo TX
Answered by: Barbara Medford
Well, you moved right ahead on that. Your shrub roots probably don't need to go down 2 feet to the bedrock, because roots tend to spread out closer to the surface for adequate gas exchange, i.e., carbon dioxide and oxygen. Either the lighter mulch decomposing or some compost mixed into the soil will help. It sounds like you have clay soil, which has nutrients in it but is composed of tiny particles that swell up and prevent the movement of oxygen to the roots. The roots can even drown, but if you are watering the yaupon less, that should help.
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