Feed Roses to make them Super Happy! ...... 1. BONE MEAL: A great way to help promote healthy blooms. 2. FISH OR KELP liquid fertilizer: Fish is a great source of nitrogen and kelp liquid helps to add trace minerals. 3. EPSOM SALT: Promotes the activity of enzyme in soil. It also causes basal breaks, the places where your roses will bloom. 4. ALFALFA MEAL: Alfalfa promotes and conditions the soil for plant growth.