Answer: Avocado trees are fussy about having well-draining soil. They're also very susceptible to salt burn. The discoloring of the leaves indicates one, if not both, problems. Avocado trees should be watered lightly and frequently. Fertilize lightly, and flood out salts that build up in the soil about every 4th watering. Avocado trees drop leaves quite heavily all year, and those leaves make a great mulch over the roots, so leave them if possible.
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