At what age should fertilizer be introduced to small palms, I have 50 seedlings of different palm variaties from 4 inches to a foot in height that have propagated over the winter and are now enjoying our 80-90s f temperatures here in tropical Southern Ontario. Would they be to young to start using small amount of Epson salts and a light fertilizing. I purchased a Schultz 16-12-12 slow release granular with micro nutrients,purchased in the Miichigan would a small amount be ok to use

Here in Ontario it is difficult to find a desireable palm fertilizer with mico nutrients... other than liquid Miracle Grow that contains some Micro Nutrients

Any recommendations would be appreciated.

Thanks Larry