Hi Jack,
Every site I have with info on these palms doesn't mention fertilizing.
http://www.floridagardener.com/palms/bismarckpalm.htm
http://www.pacsoa.org.au/palms/Bismarckia/index.html
http://www.treehelp.com/trees/palm/t...s-bismarck.asp
http://hort.ifas.ufl.edu/trees/BISNOBA.pdf
I did a google with the term:
fertilize Bismarck palm and got over 28,000 hits.* There's lots of info to choose from.* :)*
Newt
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.