You chose the bouquet, carried it home in its paper wrap, trimmed the stems and set it in water. Three days later the heads are drooping, the water has gone cloudy and petals are dropping onto the table. Early wilting is rarely bad luck. In almost every case it comes down to one of a handful of avoidable mistakes — dirty water, a blunt cut, a warm windowsill, a bowl of bananas — and each one takes seconds to put right.

Dirty water is the most common culprit

Bacteria, yeasts and moulds multiply in vase water far faster than most of us realise. Within a day or two, the stems are standing in a cloudy soup. The bacteria clog the water-conducting tissue at the base of the stem, so a flower wilts even though it is sitting in water. If the water smells at all, the damage is already under way.

If the water smells or feels slippery, the bouquet is already behind schedule.

• Change the water every two days, and daily in warm weather or a heated room.
• Wash the vase properly with hot soapy water and a bottle brush, not a quick swill. Glass develops a fine biofilm that seeds the next bloom of bacteria.
• Use the flower food sachet that came with the bouquet. It contains a feed and an antibacterial agent, and it genuinely extends vase life. If the sachet is long gone, a couple of drops of household bleach in a litre of water is a traditional stand-in.
• Re-cut the stems each time you change the water.
• Top up during the day as the stems drink, so the base of the bunch never dries out.

How you cut the stems matters more than you think

A clean cut gives the stem a wide, open surface to drink through. Blunt scissors crush the tissue, sealing the channels and undoing the benefit of fresh water. Use sharp secateurs or a sharp knife, and cut 2–3cm from the base at an angle of roughly 45 degrees. The angle stops the stem sitting flat against the bottom of the vase, where it would block its own water supply.

Strip every leaf that would sit below the waterline. Leaves rot quickly, feeding exactly the bacteria you are trying to keep at bay.

Awkward stems

Woody stems such as lilac, flowering branches and thick-stemmed roses take up water slowly. Splitting the base about 2cm with a sharp knife, or cutting on a steeper angle, helps. Flowers with milky sap — poppies are the classic example — can seal their own cut ends. A brief dip of the stem end in boiling water, or a moment over a flame, stops the sap running; keep the flower heads well clear of the heat.

Skipped conditioning: the step most bouquets never get

Conditioning means giving flowers time to drink before they go on display. Take a bouquet straight from the shop wrap to the vase and the stems are still recovering from time out of water, so they never quite catch up.

1. Unwrap the bouquet and remove netting, elastic bands and sleeves.
2. Strip the lower leaves and any bruised or damaged outer petals.
3. Cut the stems at an angle.
4. Stand them in a clean bucket of water, as deep as the stems allow, for at least two hours — ideally overnight in a cool room.
5. Arrange once the stems feel firm again.

Lukewarm water suits most flowers, since it is taken up more readily than cold. Bulb flowers such as tulips and daffodils are the exception and prefer cool water. Daffodils also release a sap that shortens the life of other flowers, so condition them in their own bucket and keep them out of mixed arrangements.

The wrong spot: sun, radiators and draughts

A windowsill in full sun looks lovely in a photograph and ruins a bouquet. Heat speeds up water loss from the petals while the stem struggles to replace it, and direct sun can scorch soft blooms within hours. The same goes for radiators, log burners, televisions and anything else throwing out warmth.

The best position is a cool room with plenty of indirect light, away from open windows, air conditioning vents and busy doorways where draughts dry the flowers out. If the room is warm, change the water more often and accept a shorter vase life.

Ethylene: what the fruit bowl is doing to your flowers

Ripening fruit and vegetables release ethylene, a natural gas that speeds up ageing in plants. Bananas are the worst offenders; a fruit bowl beside a vase of carnations, lilies or gypsophila will noticeably shorten their life. Cigarette smoke, exhaust fumes and the flowers' own dying blooms add to the problem.

Keep vases away from fruit bowls and bins, and pull out fading flowers as soon as you spot them. One rotting stem releases enough ethylene to affect everything around it. Alstroemeria, freesias and sweet peas are among the most sensitive.

Vase choice, water level and overcrowding

Fill the vase about two-thirds full, and choose one that matches the stem length: as a rough guide, two-thirds of each stem should sit below the rim. A narrow neck holds tall stems upright, while a wide bowl leaves them flopping.

Resist the urge to jam every stem into one container. Crowded flowers crush each other's stems, block water uptake and trap bacteria. If the bouquet is too big, split it between two vases. If you have only a few stems and a wide vase, a layer of clean glass marbles or pebbles in the base will hold them in place.

Rescuing a bouquet that is already drooping

A limp bouquet is not always a lost cause, particularly if it arrived by post or spent a

Photo: Sami Aksu / Pexels