I planted two windmill palms in Seattle area about 1 month ago... They are doing okay, but some of the leaves start turning yellowish toward the end. Wondering if I need to be worrying about that.

Moreover I am wondering if I need to do some fertilization at this point of the season? What kind of fertilizer I should use? I was looking to buy some palm specific fertilizer, but the manufactures don't sell these in WA. I looked only for Miracle grow palm food, and on the web site they mention that "This product is only available in the following states: AL, AZ, CA, FL, GA, LA, MS, NV, NM, and TX.

Does that mean, I should not use it in WA weather?

Please advice??