The flower food packet or flower nutrient is the best thing you can use for fresher, longer-lasting flowers. The packet contains many things: water purifiers, clarifiers and softeners, ph regulators, water uptake and plant growth regulators, and energy carriers (flower food). Simply put, the packet contains flower food and ingredients to keep the water clean and clear. These nutrients have been created by scientists who know flowers. Following the instructions on the back of the package is key to keeping the doses accurate and ensures your flowers remain fresh.
Many packets are for small amounts of water (a quart) so ask for extra packets or inquire about purchasing some from your flower seller for use with larger vases.