I have some mature 25-30 foot Mexican fan palms and a 30 foot Canary Island date palm, plus a couple of younger Canary Island date palms, misc sagos, and smaller fan palms. I am fairly new to Tucson gardening. The palms have done well in spite of what I have been doing, or because of.....My question is, what is a good feeding plan for palms of this type and age and what products are recommended for the region. How often should I be watering the palms if at all? Thanks, Bob