Looking for an organic rose food, I found this from American Rose Society.

http://www.rose.org/rose-care-articl...s-when-and-how

1 cup bone meal or superphosphate 0-20-0
1 cup cottonseed meal
1/2 cup blood meal
1/2 cup fish meal
1/2 cup Epsom salts (magnesium sulphate)

They say that's a basic recipe PER BUSH??!!!

Some of my bushes are not very big (maybe because I have been only
intermittently feeding them commercial Rose food?) but that quantity
per bush seems like overkill.

Experience/opinions appreciated.