CVBN tablets by Chrysal are good for all cut flowers. 1 tablet in the pail keeps the water clean and clear for longer and enhances the storage life of cut flowers by many days. In our trials these extend our dahlia storage life by 3 days. They keep the water clear and the stems from getting clogged while in the water. You only need 1 tablet in a pail with approximatley 3-4 inches of water in the pail.