According to the Florida Extension Service palms in home landscapes need a fertilizer with the nutrients nitrogen, phosphorus, potassium and Magnesium in a 2:1:3:1 ratio and contain sulfur You can purchase special palm blends that are close to this, or use a standard turf fertilizer that has a 3:1:2 ratio of nutrients (such as 15-5-10 or similar blend) and supplement it with a fertilizier called potassium magnesium sulfate (may also be called K-Mag or Sul-Po-Mag) which contains about 22% potassium, 11% magnesium, and 21-22% sulfur.
Use 2 cups of the turf fertilizer and 1 cup of the potassium magnesium sulfate per 100 square feet of surface area around the plants. Fertilize at least a 10 foot diameter area around each plant and as they grow this area can be expanded accordingly. Repeat 4 times per year, or possibly more if the soil is very sandy.
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