Flower Food is good for your cut flowers

Use the packets of fresh cut flower food available from your florist or which is included in your ready made bouquet. This should be dissolved in the water in the stated strength. It provides the nutrients your flowers need (potassium, phospherous and nitrogen) for longevity and also contains anit-bacterial properties to help keep the water clean.

Using the flower food in higher concentration is detrimental to the flowers as it will begin the process of reverse-osmosis, causing all nutrients to be drawn out of the stem and into the water.