On the palms in the ground (Trachycarpus fortunei, Sabal louisiana, Chamaerops humilis, and Rhapidophyllum hysterix), I use Palm Tone. On the containerized palms, I have started using Osmocote (forgot the nutrients ratio). Maybe once a month, I'll give them all a watering with Epson salts.

Any 10-10-10 or 8-8-8 or variation there of, plus or minus a few NPK numbers will work just fine, however, I have found my palms do best if also given a healthy amount of Milorganite 5-3-0 found in the grass fertilizer section of HD or Lowes.

Interesting mix virginian... How much do you fertilize and is this in addition to what sean gave us on chilly palm day? What is NPK? Sorry for all the questions - Im a learnin :)

I use Carl Pool fertilizer. Its a 3:1:3 ratio of NPK along with plentiful secondary and micronutrients.

2:1:3 is another good ratio.

NPK is the chemical symbol for Nitrogen, Phosphorus, and Potassium. The three are known as the primary macronutrients.

I tend to go "heavy" on the fertilizer to encourage as much growth as possible. I use the more expensive 40 pound bags of palm fertilizer you can buy at Home Depot. Also use a bit of Chelated Palm liquid. Also use manganese sulfate for my queens, mules, and just a bit for CIDPs. So far everything has gone well...though I did burn my young Pindos last time. They appear to be slightly more probable to burning verses my other young palms.

Thanks all for the suggestions. I'm going to try the Carl Pool product. Are there certain micronutrients that palms require more of than other plants?

most palms need a good supply of magnesium, which is why most use Epsom salts. Also certain palms, especially Queen palms require manganese, to prevent a condition known as "frizzle top"