Hi, to everyone that loves their palms too.
Whenever my palms look a little on the yellow side. I green them up with epsom salts which is magnesium sulfate. Regular fertilizers do not have enough of this trace element that they need. Every spring and late summer I sprinkle a 1/2 cup around the base and water it in. This is in addition to their regular food every 3 months. Potassium nitrate is something I will have to try out, thanks jnstropic.