How to Make Cut Flowers Last Longer

Cut flowers are still alive. They drink, breathe and age, and almost everything that shortens their life comes down to four things: bacteria in the water, air in the stems, ethylene gas and heat. Keep those in check with a simple routine and most arrangements stay fresh for about 5 to 10 days, depending on the flowers.

Why cut flowers fade

• Bacteria. Every cut stem leaks sugars and sap into the water. Bacteria feed on it, multiply, and clog the tiny water channels in the stem. The flower goes thirsty while standing in a full vase. Cloudy or smelly water is the warning sign.
• Air in the stems. Once a stem has been out of water, even briefly, air bubbles can block the bottom of it. A fresh cut removes the blocked part so water can flow again.
• Ethylene. This is a natural ripening gas. Ripening fruit gives it off, so does smoke, and so do fading flowers. Many flowers age faster around it.
• Heat. Warmth speeds everything up: the flower breathes faster, uses its stored sugar sooner and loses more water through its petals and leaves. Warm water also grows bacteria faster.

The daily routine

Most of our vase arrangements are designed in water, right in the vase. That makes care simple:

1. Top up every day. Flowers drink more than people expect, especially in the first two days. Keep the water level well above the stem ends.
2. Change the water every 2 days or so, and right away if it turns cloudy. Hold the design together with one hand, tip out the old water, rinse the vase and refill with fresh room-temperature water, plus flower food while you have some left.
3. Re-trim when you change the water. Take about an inch off each stem at an angle with a sharp, clean knife or pruners, and put the flowers straight back into water.
4. Pull anything that fades. Take out wilted blooms and brown leaves as soon as you see them.

If your design sits in green floral foam (a few do), keep the foam soaked: top it up daily with water and don't pull stems out, since a stem pushed back in often loses contact with the wet foam.

A clean vase and a clean cut

Start clean. Wash it with hot soapy water and a brush, and rinse well. If you are putting a hand-tied bouquet into your own vase, our guide to putting a bouquet in a vase walks through it step by step.

• Use a sharp blade. Dull scissors crush the water channels at the end of the stem. A sharp knife or good pruners give a clean cut that drinks freely.
• Cut at an angle. An angled end can't sit flat against the bottom of the vase and seal itself off.
• Keep the blade clean. Wipe it off between jobs so you are not carrying bacteria from one stem to the next.
• Woody stems such as lilac or hydrangea need the same clean angled cut. A short vertical split at the base is optional. Please don't smash stems with a hammer; crushed tissue rots faster.

Leaves below the waterline

Strip every leaf that would sit under water. Submerged leaves break down within a day or two and feed the bacteria that clog stems. Leaves above the water can stay for looks, but every leaf also loses water. On thirsty stems such as lilac, stripping most of the leaves helps keep the flowers themselves watered. Check again whenever you re-trim and shorten the stems.

Use the flower food packet

We include a packet of flower food with every order, and it is the single most useful thing you can add to the water. It does three jobs at once: sugar to feed the flowers and help buds open, an acidifier that helps water move up the stem, and a biocide that holds back bacteria.

• Mix it at the strength on the packet. Too little leaves the flowers underfed and lets bacteria win. Too much can burn stems and yellow leaves. Match the packet to the amount of water it names, not to the size of the vase.
• When to add it. For a hand-tied bouquet, stir it into the vase water right away. For a vase arrangement, stir it in on the first day when you top up, so the flowers have it while they drink the most. Once it runs out, clean fresh water, a clean vase and a fresh cut are the next best thing.
• Metal and crystal containers: flower food is acidic, so use a plain glass or plastic liner inside a metal or crystal vase.

Where to put them

• Cool, bright, out of direct sun. A spot around room temperature (roughly 65 to 72°F) is right. Keep them off sunny windowsills and away from radiators, steam heat, heating and air-conditioning vents, and ceiling fans.
• Away from the fruit bowl. Ripening bananas, apples and other fruit give off ethylene. Keep flowers out of the kitchen if you can, and away from smoke.
• Off the top of the TV and appliances, which give off heat.
• Cooler at night. If you can, move the vase to the coolest room overnight, away from heat. A few cool hours every night slows aging and adds days.
• Out of reach of pets. Some flowers, lilies above all, are dangerous to cats, even the pollen or vase water. See our guide to pet-safe flowers.

If flowers do wilt, many can come back. Our guide to reviving drooping flowers explains what to try.

Myths to skip

The internet is full of vase-water tricks. Use the packet instead.

• Sugar. Flowers do use sugar, but sugar on its own feeds bacteria just as well. The packet pairs sugar with something to hold bacteria back.
• Soda. Same problem: sugar and acid, nothing to stop the cloudy water.
• Aspirin. Not a substitute for flower food. It doesn't feed the flowers or keep the water clean in any reliable way.
• Pennies. Modern pennies are mostly zinc with a thin copper coat, and even copper does far less than a proper biocide.
• Bleach recipes. Bleach does kill bacteria, but the right amount is tiny and too much damages stems. The packet is already measured for you.
• Misting the petals. Most cut flowers don't need it, and wet petals can spot or rot. Put your effort into the water. Hydrangeas are the exception: a light mist helps them, as our hydrangea guide explains.

Every flower has its own quirks. For the specifics, see our guides to rose care and hydrangea care, or start with what to do when your flowers arrive.