I regularly attend the garden seminars put on by the agents from University of Florida. One thing they caution about is, if you have palms in your yard, to avoid fertilizer with fast release nitrogen (which is a common ingerdient in many lawn fertilizers). The reason for this is that the root system for the palms will be under your grass and hence they will be fed what you are giving your grass. Palms need all ingregients to be slow release. The effect of using a fast release nitrogen on palms is that it throws the palms into a state of imbalance: when they get a sudden shot of nitrogen, they will look for a corresponding mix of other ingredients that they need. If they don't get it, they will get yellow spots in their leaves from the imbalance.
Their bottom line recommendation is to use a slow release palm fertilizer on everything: palms, shrubs and lawns.
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