The Q&A Archives: Grapefruit Trees

Question: We have Grapefruit trees growing in 5 Gal. plastic buckets that are out side when all chance of frost is gone and then brought in house for the Winter. The trees are only 5 feet tall but are 25 years old. What quanity of plant food should we use? Should it be used year round?

Answer: Citrus are unique, having root systems that fit readily into containers of average depth. You can use a balanced all-purpose fertilizer (liquid or granular) when your plant is growing new leaves. Apply according to label directions. These slow release formulations should be applied only once each year. If you prefer to feed at more frequent intervals, dilute a liquid fertilizer (1 teaspoon per gallon of water) and feed monthly during the growing season. Citrus growing in containers sometimes develop a manganese deficiency. You can remedy this situation by applying 1 tablespoon Epsom salts per 3 gallons of soil, diluted with water or sprinkled on the soil once each year.

Continued good health to your trees!

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