A bouquet arrives looking immaculate and, two days later, half of it is slumped over the rim of the vase. Usually it isn't the flowers' fault. It's the twenty minutes nobody spent on them before they went into water. Conditioning — stripping, trimming, hydrating and resting — is what florists do behind the counter and most of us skip at home. It takes a few minutes, and it's the difference between a bouquet that lasts four days and one that lasts well over a week.

What conditioning actually does

A cut flower is a living thing with a wound. The stem keeps respiring and losing moisture through its leaves and petals, but it can only replace that water if it can draw it up cleanly. Three things get in the way: air bubbles sealing the water-carrying vessels, bacteria multiplying in the water and at the cut surface, and leaves left sitting below the waterline, quietly rotting.

Conditioning deals with all three. Take off anything that will be submerged, slice a fresh bit of stem so the cut is open, stand the flowers in clean water and let them drink somewhere cool. That's the whole idea. Everything else is detail.

What you'll need

• A clean bucket. Not the mopping one. Wash it in hot soapy water and rinse it well, because a residue of old water is a bacterial starter kit. Two-thirds full of fresh water suits most bouquets.
• Sharp scissors or bypass secateurs. Blunt blades crush stems rather than cutting them, and a crushed stem can't drink properly. Bypass secateurs generally do less damage than anvil types.
• Flower food, usually the sachet that came with the bouquet. If there isn't one, fresh water changed daily gets you most of the way there.
• Gardening gloves if you're dealing with roses or anything thorny.
• A cool spot out of direct sun, away from radiators, draughts and the fruit bowl.

The five steps, in order

1. Unwrap and assess

Take off the cellophane, paper and ribbon, and lay the stems out on a worktop. Look at what you've actually got: bruised heads, brown or translucent petals, snapped stems, yellowing foliage. Peel the damaged outer guard petals off roses — they're there to protect the bloom and they won't recover. Anything already slimy at the base is unlikely to come back, so set it aside rather than letting it spoil the rest.

2. Strip leaves and thorns

Work from the bottom up. Remove every leaf, side shoot and thorn that will sit below the waterline in your finished vase — submerged foliage rots, and that rot is what clouds the water and makes it smell within a day. Above the waterline, leave the foliage alone; it's part of the design and it feeds the plant. On roses, snapping thorns off with your thumb or a rose stripper is neater than cutting them, but don't tear the stem's outer layer.

3. Cut the stems properly

If it's practical, hold each stem underwater while you cut it — a bowl or the bucket works fine. Cutting under water stops air being drawn into the stem. Take 2–3cm off at a steep angle, roughly 45 degrees, in one clean motion. The angle gives the stem a bigger drinking surface and stops it sitting flat on the bottom of the vase. Woody stems such as roses, lilac and chrysanthemums benefit from a slightly longer cut. Skip the old advice about hammering or crushing the ends; that damages the tissue you're relying on.

4. Get them into water straight away

Plunge the stems into the bucket within a minute or two of cutting, and stand them deep — at least two-thirds of the stem length under water. Lukewarm water, meaning cool room temperature rather than straight from the cold tap, is absorbed more easily and dissolves flower food better. Spring bulbs such as tulips and daffodils prefer cold water.

5. Leave them somewhere cool to rest

Two hours is the minimum; overnight is better. The flowers are rehydrating and the stems are hardening off. Don't arrange them yet. This is the step people skip, and it does most of the work.

The awkward ones: daffodils, tulips, hydrangeas and roses

Daffodils release a sap that shortens the life of other flowers. Condition them in their own water for at least a few hours, ideally overnight, before mixing them with anything else — and never re-cut them into water that other stems are drinking from.

Tulips keep growing after cutting and will bend towards the light. Use cold water and only a third of the stem submerged; they don't need depth and they don't like being crowded.

Hydrangeas are heavy drinkers with woody stems. Slash the base vertically to open up more surface, or dip the bottom 2–3cm into just-boiled water for a few seconds, then move them straight into cold water.

Roses want thorns and lower leaves stripped, a sharp angled cut, and a full night in deep water. If a head droops while the stem stays firm, it's usually air in the stem: re-cut and float the flower head in a shallow bowl of cool water for an hour or so.

Timing: when to condition and how long to give it

The best routine is to condition the bouquet the evening it arrives and arrange it the next morning. If you're preparing flowers for an event, start the day before — a full night in water is standard practice for a reason. Short of time? Thirty minutes in deep water after a fresh cut is far better than nothing.

Then condition again on day three or four. Re-trim 2cm from each stem, wash the vase, refill with fresh water. That single re-cut can add several days to a bouquet that looked like it was fading.

Keeping the bouquet going once it's arranged

Change the water every day or two and re-trim the stems each time. Keep the vase out of direct sunlight and away from radiators, and move the fruit bowl to another room — ripening fruit gives off ethylene gas, which ages flowers faster. Pull fading blooms out as they go rather than leaving them to sit in the mix. If the water starts to smell, the stems are rotting at the base: tip it out, wash the vase thoroughly, trim and start again.

One last thing worth knowing: some people find daffodil sap and certain foliage irritating to the skin, so wear gloves if your hands are sensitive and wash them afterwards.

The five-minute habit

Conditioning isn't a floristry secret so much as an unglamorous habit: clean bucket, sharp blade, angled cut, deep water, cool room, patience. Do it the day your bouquet arrives and you'll get the best part of a week and more out of the same flowers. Skip it, and you're paying for something that only looks right for a weekend. If you're unsure about a particular stem, ask the florist who sold it to you — they'll know exactly how that flower wants to be treated.

Photo: Nick_the_Photographer / Pixabay