How long do cut flowers last in a vase?

Most fresh cut flowers last five to ten days in a vase if they are handled well. Locally grown flowers usually outlast imported ones by several days simply because they were cut more recently. The three things that make the biggest difference are cutting in the cool of the morning, stripping any leaves that sit below the waterline, and changing the water every two days.

I get asked this a lot, usually by someone who has had a bunch collapse on them in three days and is quietly wondering whether they did something wrong.

Usually they did not. Usually the flowers were already old when they got them.

Why do some flowers last a week and others three days?

It comes down to how long ago the stem was cut, and what happened to it in between.

A flower is still alive in the vase. It is drinking, and it is using up the sugars it stored while it was growing. The clock starts the moment it leaves the plant. Every day between cutting and your kitchen bench is a day off the end.

A bunch I cut on a Saturday morning and hand over on Saturday afternoon starts its life in your house with everything still ahead of it. A bunch that was cut somewhere far away, chilled, freighted, held in a distribution centre and then sat on a shelf has already spent most of what it had.

That is not a criticism of anyone. It is just distance.

What can I do to make cut flowers last longer?

Get them into water fast. If they are coming home in a hot car, that is the worst part of their day. Take a bucket if you are collecting from me. If you cannot, just get them into water the moment you are home.

Strip the leaves below the waterline. Any leaf sitting in water will rot, and rotting foliage breeds the bacteria that block the stem so it cannot drink. This is the single highest-value thing on this list and it takes twenty seconds.

Recut the stems on an angle. Take a centimetre or two off with something sharp. A clean cut with more surface area drinks better than a crushed, sealed-over one. Scissors crush, so a sharp knife or proper snips are better.

Use a clean vase. Actually washed, not just rinsed. Bacteria left from the last bunch will go to work on this one.

Change the water every two days. Not top it up. Change it, and recut the stems while you are there if you can be bothered. This alone can add days.

Keep them out of the sun, away from the heat pump, and off the fruit bowl. Ripening fruit gives off ethylene gas, which makes flowers age faster. It is a genuine thing, not an old wives' tale.

When is the best time to cut flowers from the garden?

Early morning, while it is still cool and before the sun has been on the plants.

Overnight the plant refills itself with water, so at dawn the stems are as full as they will ever be. By mid afternoon on a hot day the same plant is under stress and the stems are already partly depleted. Cut then and the flower starts on the back foot.

Take a bucket of water out with you and put every stem straight in as you cut it. Do not collect an armful in the crook of your elbow to deal with later, however romantic it looks. Ten minutes out of water in the sun is a real cost.

Evening is the second best time if mornings do not work for you. Middle of a hot day is the worst.

Does that flower food sachet actually do anything?

Yes. It is usually a sugar to feed the flower, an acidifier to help the stem drink, and a small amount of biocide to slow the bacteria. It does help.

If you do not have one, the honest answer is that clean water changed regularly gets you most of the way there. The homemade recipes involving lemonade and bleach do work on the same principle, though the ratios matter more than people think, and plain fresh water is safer than a badly guessed mixture.

Which flowers last the longest?

Of what I grow, zinnias, celosia and scabiosa are the troopers. Zinnias will give you a good week and often more if you cut them at the right stage. Celosia is remarkably long lasting and dries beautifully afterwards, so it has a second life.

Cosmos is more delicate and will not go as long, but it produces so freely that you can afford to refresh the vase.

One thing that matters more than the variety: cut at the right stage. Zinnias in particular do not keep opening after cutting, so a bud will simply stay a bud. Give the stem a gentle wiggle 20cm below the head. Floppy means wait. Firm means cut.

Frequently asked questions

How long do fresh cut flowers last?
Five to ten days for most varieties when handled well. Locally grown flowers usually last longer than imported ones because less time has passed since they were cut.

What is the best way to make cut flowers last longer?
Strip any leaves below the waterline, recut the stems on an angle with something sharp, use a clean vase, and change the water every two days.

Should I cut flowers in the morning or evening?
Morning, while it is cool and the stems are full of water. Evening is the next best. Avoid the middle of a hot day.

Why do my flowers wilt after a few days?
Usually bacteria blocking the stems. It is caused by leaves rotting in the water or a vase that was not properly clean.

Do flowers really last longer away from fruit?
Yes. Ripening fruit releases ethylene gas, which speeds up ageing in cut flowers.