With both your feeding questions, I am stumped to know why you want to feed them now. The shrubs already have their flower buds ready to bloom, so feeding will do nothing for them at the moment. Perhaps next autumn you could put some compost around the base to help next years growth.
Bulbs will feed themselves when they have finished flowering, if you do not cut the tops off. The bulb is an energy store for the plant and that should also be full up and ready to go. Compost in the autumn once again.
Growmore is not needed with these plants.
