I hate to say it but I have not fertilized them yet. I have them in my butterfly garden and I am petrified to do anything ie fertilize OR anything for bugs because I have had a tremendous amount of butterflies there and did not want to mess with anything as I am not sure what would be safe to use. Might someone have a suggestion on both accounts? I am thinking the milkweed probably are having the same issue since I do not fertilize them