PlanTea is also an excellent cut flower preservative. Mix 1 part liquid concentrate to 6 parts water. Change the water every few days. Always make a cut on a slant, as it exposes more stem surface area. Also, remove leaves that will be under water in the arrangement, but do not remove thorns from roses as it tends to shorten their life.
Maturity also affects their keeping qualities.
Cut on a slant and remove leaves that will be under water in the vase. I would like my roses to see you. Each has its own charms. The only thing I don't like is fake flowers. They give me the creeps.