You need to be fertilizing a few times a year with a palm fertilizer that contains mico-nutrients (which must include boron). Magnesium (epsom salts) is a fast fix for the oldest palm fronds which may be yellowing. Use according to the directions.
Do not fertilize during the winter months, but that includes all plants.
There are many informative articles on the Internet. Plug in the keyword Sylvester palms or simply palms and you will learn a lot!
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~~ Robert W. Service ~~
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