You could try contacting the master gardener and ask your questions. We have 4 palms, 2 Sylvester's and 2 canary. All have been fertilized and regularly watered. The 2 Sylvester's are green, especially when compared to the neighbors, the 2 canary's have very slight yellowing. I get specific palm fertilizer from One Site in Leesburg, 50 pound bag, $50, but I understand there is a firm that delivers for the same price.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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