Iron deficiency appears as yellowing of young leaves (the ends of the shoots) while the older leaves remain green. Miracid can be sprayed onto the plants and drenched into the soil to help alleviate the problem. However, you should repeat this periodically to maintain green growth. Iron chelate products are another good option for severe iron deficiency.
If older leaves are yellow the problem could be nitrogen deficiency, too much or too little water, root disease (usually related to soggy soil conditions) or the natural change of the seasons in spring (when new growth comes on, the older leaves often turn yellow and fall from the plant).
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