How to care for dahlias in a vase

Dahlias are one of the most rewarding flowers to have in a vase, but they do need a bit more attention than, say, a chrysanthemum. They're thirsty, they don't like heat, and they need their stems cut properly. Get those things right and they'll last seven to ten days.

The stem cut matters more than usual ¶

Dahlias have hollow or semi-hollow stems, which means they can take in water quickly but also lose it quickly. Cut the stems at a sharp angle, about 2-3cm from the bottom, and put them straight into water. Don't leave them out of water for more than a minute or two after cutting.

Some florists recommend singeing the cut end of a dahlia stem with a flame for a few seconds before putting it in water. This seals the stem and can extend vase life. It's worth trying if you find your dahlias are wilting faster than expected.

Keep the water deep and change it often ¶

Dahlias drink a lot. Use a tall vase with plenty of water and check the level daily. Change the water completely every two days and recut the stems each time. If the water goes cloudy quickly, the bacteria count is high and the flowers will decline faster.

Temperature and light ¶

Dahlias don't like heat or direct sunlight. A cool room, away from windows and radiators, is ideal. If you have a particularly warm house, putting them somewhere cooler overnight can add a day or two to their life.

They also don't like draughts, so avoid placing them near an open window or a fan.

Dahlias are worth the extra attention. A well-kept dahlia in a vase is one of the better things about September.