Ten citrus trees (shrubs- really) grow on my property in San Diego. They are heavy feeders, from what I have read, and are often deficient in zinc and magnesium. Organic fertilizers are expensive, and now, with gmo, I do not want bird products or alfalfa in my fertilizer. I have a local source for free horse manure- if that helps. The trees are mulched with pecan leaves. Do you have any advice for me on how to fertilze my trees or how to take good care of them? If you know about citrus, can you give me a rough idea of how often and when to fertilize. A couple of them have lost most of their leaves and are looking poor, and I am not sure what I did wrong.
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