To keep cut flowers fresh, add the flower food packet, or mix 1 teaspoon of sugar, 2 teaspoons of lemon juice and a quarter teaspoon of bleach into each quart of water. Sugar feeds the flowers, acid helps stems drink, and bleach stops bacteria. Change the water every 2 days.
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The little packet that comes with a bouquet is not a gimmick. It holds the three things cut flowers need to last: food, acid and something to keep the water clean.
A cut flower has lost its roots and leaves, so it has lost its food supply. Bacteria also grow fast in vase water and clog the stems. Fix both problems, and most bouquets last days longer.
The simple homemade flower food
If you do not have a packet, mix this into each quart of lukewarm water:
- 1 teaspoon of sugar. It feeds the flowers so buds keep opening.
- 2 teaspoons of lemon juice. The acid helps stems pull up water more easily.
- A quarter teaspoon of plain household bleach. Just a little keeps bacteria and slime from growing.
Stir until the sugar dissolves, then add the flowers. Use plain, unscented bleach only.
Which home tricks actually work
| What to add | Does it work |
|---|---|
| Flower food packet | Yes, the best choice |
| Sugar, acid and bleach mix | Yes, works almost as well |
| Sugar alone | Partly, but bacteria grow faster |
| A few drops of bleach alone | Partly, keeps water clean |
| Aspirin | Little proof it helps |
| A copper penny | No real effect |
Clean water matters more than any single trick. A dirty vase cancels out the best flower food.
How to keep flowers fresh longer
What you put in the water is only half the job. These habits make the biggest difference:
- Start with a clean vase. Wash it with hot, soapy water to remove old bacteria.
- Recut the stems. Trim about an inch at an angle before arranging, so stems can drink.
- Strip low leaves. Any leaf below the waterline rots and feeds bacteria.
- Change the water every 2 days. Rinse the vase, mix fresh flower food, and trim stems again.
- Keep them cool. Heat, direct sun and drafts all shorten vase life.
Special cases
Daffodils release a sap that shortens the life of other flowers. Keep them in their own vase for a day before mixing them into a bouquet, and do not recut them after that.
Woody stems like lilac and hydrangea drink better if you cut them with a sharp knife and split the base an inch or so. Hydrangeas also benefit from a quick dunk of the flower head in cool water when they droop.
Tulips keep growing in the vase and bend toward light. Turn the vase each day to keep them straight.
For how long flowers last out of water, see our guide on how long flowers can go without water. Growing your own cutting flowers? Our guide to watering flowers will help.
Flower Water FAQ
Does sugar keep flowers fresh?
It helps, because it feeds the flowers. But sugar alone also feeds bacteria, so add a little bleach or lemon juice with it.
How often should I change flower water?
Every 2 days is ideal. Rinse the vase, add fresh water and flower food, and trim the stems each time.
Does putting aspirin in flower water work?
There is little proof that it helps. A proper flower food or the sugar, lemon and bleach mix works far better.
We turn horticulture research and real growing experience into plain-English watering schedules you can actually follow.