When all danger of frost is past, begin feeding citrus trees. (If your garden gets frost in February, wait until March.) Citrus are heavy feeders. A mature citrus tree in clay soil needs one pound of actual nitrogen a year. For example, if you choose a commercial fertilizer containing 16% nitrogen, such as 16-16-16, your tree would need 6 pounds of this product per year. Divide the fertilizer into equal batches and broadcast one batch all over the root zone once a month from now through June. Use less on younger trees.
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