I also use bag fertilizer, a 40lb bag of 13-13-13, for $5. I just scoop some out and apply it lightly to the garden every two weeks when the bulbs are in active growth. I have liquid fertilizers, but I don't have time to pamper stuff. I dug up some Habranthus bulbs to plant something else, and they were huge compared to previous years. Could be the rain we've been getting or maybe its the fertilizer? Charles Edelman South Texas 85 degrees and sunny