How Often Should You Change Flower Water?

Change the water in a vase of cut flowers every one to two days, and immediately if it looks cloudy, smells or has a film on the surface. Daily changes are best for flowers that foul water quickly, such as chrysanthemums, sunflowers, stocks and anything with soft stems; hardier stems like roses and carnations can manage every second day if the vase is clean.

Fresh water matters more than any additive. Most of the damage to a bouquet happens invisibly inside the stems, where bacteria from dirty water block the channels that carry water to the flower heads. Below is a florist's explanation of what goes wrong in the vase, a simple routine that takes two minutes, and the small details that decide whether a bouquet lasts four days or ten.

What happens to vase water in 48 hours

From the moment a stem is cut, bacteria start feeding on the sugars and plant tissue that leach into the water. In a warm room the population roughly doubles every few hours. By the second day, water that looked clear on the first morning can carry millions of bacteria per millilitre, even if it still looks almost clean.

Those bacteria do not just float around. They gather at the cut end and form a slimy layer that plugs the xylem, the thin tubes a stem drinks through. The flower head then behaves as if the vase were empty: roses droop at the neck, gerberas bend, and leaves go limp, all while standing in water. That is why changing the water is about hygiene, not just topping up.

Leaves below the water line make everything faster. They rot within a day and feed the bacteria directly, so strip every leaf that would sit in water before you arrange the bouquet. One forgotten leaf can turn a vase murky by the next morning.

A two-minute daily routine

Lift the bouquet out and hold it over the sink. Pour away all the old water rather than adding fresh water on top, rinse the vase with hot water and, if you can feel any slipperiness on the inside, wipe it with a brush or a sponge and a drop of washing-up liquid. Rinse well, because detergent residue is not good for stems either.

Refill with cool or room-temperature tap water. The level depends on the flowers: most bouquets do well with the stems in 8-12 cm of water, while tulips and gerberas prefer less. Our guide on how much water should be in a vase goes through the common varieties one by one.

Every second change, recut each stem by 1-2 cm at a sharp angle with a clean knife or secateurs. This removes the plugged section and opens fresh channels. Cut quickly and put the stems straight back into water, so air does not get drawn into the cut end. If you have a sachet of flower food, dissolve it in the fresh water each time rather than only once.

The vase itself plays a part. A narrow-necked vase holds stems upright but is hard to scrub, so give it a bottle brush once a week. A wide, shallow bowl warms up faster and exposes more water to air and dust, which means it needs changing more often. Glass lets you see the water clearly, which is useful: the moment it loses its sparkle or the stems look slimy at the base, it is time to change it, whatever the schedule says.

Finally, check the bouquet as a whole. Remove any flower that has gone over, since a fading bloom releases ethylene that speeds up its neighbours. A bouquet that loses one rose on day five and has it removed often looks good until day eight or nine.

Bouquets we can deliver

Bouquet of 1 yellow sunflowers

$13

Bouquet of 3 white French roses with eucalyptus, 50 cm

$18

Bouquet of 3 red French roses with eucalyptus, 50 cm

$18

Bouquet of 3 pink roses with eucalyptus, 50 cm

$18

Flowers that need more frequent changes

Some flowers are much dirtier in a vase than others. Chrysanthemums, asters and other composite flowers have leafy, fibrous stems that break down quickly. Stocks (matthiola) smell wonderful but turn water foul by the second day. Sunflowers drink heavily and shed stem tissue. For all of these, change the water every day without exception.

Daffodils and narcissi release a sap that shortens the life of other flowers. If you mix them into a bouquet, let them stand alone in water for several hours first, and change the shared water daily. Hydrangeas drink so much that the level can drop by half overnight, so check them in the morning and in the evening.

Roses, carnations, alstroemeria and lisianthus are more forgiving. With clean, leaf-free stems and flower food, every second day is acceptable, though daily changes still add a couple of days to their life. Tulips keep growing in the vase and bend towards light, so a daily change is also a good moment to turn the vase and recut them.

Common mistakes that shorten vase life

Topping up instead of changing is the most common one. It keeps the level up but leaves the bacterial load where it was, and the bouquet still fails early. The second is using a vase that was rinsed but never scrubbed: a thin biofilm on the glass reinfects every batch of fresh water within hours.

Heat and sunlight work against you too. Water in a vase on a radiator or a sunny windowsill warms up and grows bacteria much faster, so a bouquet there may need water changes twice a day. A cooler spot out of direct sun and away from the fruit bowl makes the routine far more effective.

Home remedies such as aspirin, coins, sugar or a splash of lemonade are mostly myths or half-truths. Sugar without an antibacterial agent feeds bacteria more than flowers. A few drops of household bleach per litre does reduce bacteria, but it is easy to overdo; clean water changed often is simpler and safer. For a fuller schedule over a whole week, see our florist's plan for vase water changes.

When you send flowers to someone far away

If you are abroad and sending a bouquet to family in Russia, the care routine becomes part of the gift. A short line on the card, such as a reminder to change the water every day and trim the stems, is something many recipients appreciate, especially older relatives who may not know the trick. The card with your text is free, and delivery is anonymous unless you sign it.

Timing helps as well. A bouquet delivered on the day of a birthday spends its whole life in the recipient's vase rather than in storage, and Russian birthday customs have their own details, which we cover in our note on Russian birthday flower etiquette. You can order for express delivery in large cities, 1-2 hours after confirmation, choose a window of 09-12, 12-15, 15-18 or 18-21, or pre-order 1-30 days ahead.

City delivery costs 500 RUB, and for remote districts and suburbs the operator confirms the price when confirming the order. Payment is online by bank card, SBP or Yandex Pay. The courier calls the recipient about 15 minutes before arrival. To agree the card text or see a photo of the bouquet before delivery, message a manager on WhatsApp, or start by choosing from the bouquets catalogue. We deliver bouquets across Russia in 1–2 hours.