Answer: Several things could be wrong. When young leaves (those near the end of shoots) turn yellow, we ususally consider an iron deficiency to be the cause. High pH, high phosphorous and of course low soil iron levels all can result in iron deficiency symptoms. If older leaves are yellowing, nitrogen may be deficient. Citrus trees thrive on constant moisture, so apply enough water slowly and deeply to thoroughly soak the root mass. Citrus are also heavy "feeders." Apply fertilizer three times per year, using 1/3 of their total annual nitrogen requirements. Apply in Jan/Feb, April/May, and Aug/Sept. The amount to apply depends on their size. Follow package instructions and water thoroughly before and after fertilizing. Good luck with your citrus!
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