AnswerYou will use it once in the spring and once mid-fall. If this is when your vacation is planned then you would want to use it at this time. If not your trees will be fien until you return. http://lawn-and-garden.hardwarestore.com/77-498-fertilizer-spikes/miracle-gro-tree-and-shrub-fertilizer-spikes-101810.aspx

AnswerThere are your local garden stores or hardware store that will sell you some fertilizer for your tree. You can also find many choices online that will be wonderful choices as well.

AnswerIf your palm tree will not grow, there are a few steps you should take before you should look into a different fertilizer. The first step would have to be, are you planting it deep enough? Second, would be, is the palm tree getting enough sunlight? Thirdly, it would be is the palm tree receiving enough water? And to answer your original question, there are specific fertilizers you can use. I would suggest going to your local gardening shop and see what they might suggest as the area might need different nutrients in the soil.