What is the best fertilizer to use on roses to hold huge blooms?
Answers: An old fashioned trick me and my grandmother use is crushing a few egg shells and scattering them around the remains of the bush. . . We have lots of blooms :)
I would recommend buying a fertilizer specifically formulated for roses. Some fertilizers are geared toward blooms and this type would also be angelic. In addition, fish emulsion is a great fertilizer for roses. Aged nourishment applied in slowly winter or early spring will also supply them a boost.