Answer: A purplish tint on leaves and fruit can indicate a nutrient deficiency or exposure to cold weather. Here are some general guidelines for care:
Citrus trees adapt well to growing in containers. During the growing season, keep them evenly moist but not sopping wet and provide them with plenty of sunshine. Fertilize according to the label instructions with a fertilizer containing micronutrients (particularly zinc, iron and manganese) as well as the usual nitrogen, phosphorus and potassium found in complete fertilizers. During the winter, reduce the watering somewhat when they slow their growth.
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