Fertilizing Florida Orange Trees - Knowledgebase Question

Lancaster, NY
Avatar for budn
Question by budn
January 22, 1999
My aunt in Florida asked me to see if I could find out the best time to fertilize her orange trees. Can you help?

Answer from NGA
January 22, 1999
There is no magic formula for fertilizing citrus in Florida. Type of citrus, soil fertility and other factors all greatly affect the need for fertilizer.

Without a soil test of go by, I would suggest your aunt apply 1 cup of a 3-1-2 ratio fertilizer (such as 15-5-10) and 1/2 cup of Potassium Magnesium Sulfate (also called Sul-Po-Mag or K-Mag) per inch of trunk diameter every 4-6 weeks from February through July. Once the tree is 5 or 6 years old and depending on growth, she may choose to reduce the rate by 1/2 and the applications to every two months.

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