what fertilizer is best for all palms
Note that this is a ratio, not the formulae you are looking for. So, a 15:5:15 ratio would be ideal (note the ratio of 3:1:3). The company Scotts has just released what appears to be an ideal palm fertilizer with microelements, magnesium and calcium. Consider buying a slow release fertilizer. It is more expensive but probably better for the plants and less labor intensive.