Answer: Citrus trees are heavy feeders because they're active all year around producing leaves, flowers and fruit. In the ground, they're fertilized 4-6 times a year; in a container, they should be fertilized more often. I'd use a liquid fertilizer such as Peter's or Miracle-Gro, diluted to half-strength and applied every 2-3 weeks. It will take a few weeks for you to see an improvement in the leaf color. Best wishes with your citrus trees!
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