When an arrangement leaves the studio, we send it with a short set of instructions. People often ask for a secret, something to add to the water or a trick with the stems. The honest answer is that the basics matter more than any additive. Here is what we actually do.
Start with a clean vessel
Before the flowers go in, wash the vase with warm water and a little soap, then rinse it well. A vase that has held flowers before can carry bacteria on the sides, even if it looks clear. Those bacteria are what make stems slimy and water murky. A clean start buys you several extra days.
Use a vase that fits the arrangement. A wide, shallow bowl is fine for a low centerpiece, but tall stems need something that holds them upright. If the stems are crowded, air cannot move between them and the middle of the bunch stays wet. Give them a little room.
Cut at an angle, with something sharp
Cut the stems at a slant, about an inch from the bottom, with a sharp knife or floral snips. A clean cut lets the stem take up water. A crushed cut, made with dull scissors, closes the channels. The angle gives the stem more surface area and keeps the bottom from sitting flat against the vase.
Do this every two days, or whenever you change the water. You do not need to take the whole arrangement apart. Lift it out, trim the ends, rinse the vase, and put it back with fresh water. Woody stems can be cut a little higher and, if they are very hard, given a small vertical slit at the base.
Remove what will sit underwater
Leaves below the waterline will rot. They are the main reason a vase starts to smell. Strip the lower leaves before the stems go in, even if it makes the arrangement look a little bare at first. The flowers will cover the gap.
If a stem has a lot of side shoots, remove the ones that will be submerged. This is especially important with branches and anything harvested from a garden after rain.
Change the water, not just top it up
Fresh water every two days is the single most useful habit. Do not simply add water to the old water; empty the vase, rinse it, and refill. If the water is murky, change it immediately. On very hot days, check it daily.
Some people add a pinch of sugar or a drop of bleach. We usually skip both. Sugar feeds bacteria as well as flowers, and bleach is easy to overdo. If you want to use a commercial flower food, follow the packet. It is designed for the job.
Keep them cool and away from fruit
Heat makes flowers open faster and fade sooner. Keep arrangements out of direct sun, away from radiators, and off the top of a warm appliance. A cool corner is better than a bright ledge for most stems.
Ripening fruit gives off ethylene gas, which can shorten the life of flowers. Move the fruit bowl away from the vase, especially if you have roses, sweet peas, or anything delicate. A closed, stuffy room is also harder on flowers than a room with moving air.
Know when to let go
Some flowers last a week; some last two days. Dahlias are beautiful and brief. Hydrangeas can be revived by recutting and submerging the heads in cool water for a short time, but only if they have not gone too far. Ranunculus and anemones are generous for a few days and then gone.
When a stem droops, take it out. One dying flower can bring down the whole arrangement, and the smell is a warning. A smaller, healthier bunch in clean water is always better than a full vase that is quietly rotting.