Dahlia – Plant Of The Week
- Posted By: Phil
Posted in: Plant Of The Week
18th May 2021
Dahlias put on a show in summer and autumn. They come in a wide range of colours from pastels to brights. Very floriferous, they’re also good for cutting.
Dahlias are easy to grow, they require a fertile, moist but well-drained soil, and a sunny, sheltered spot. Taller varieties need staking. In autumn, dig up the tubers and overwinter them in a frost-free place such as a greenhouse or a shed.
If your dahlia flower heads are large, you can put in stout posts, one per stem, and tie in these stems to stop plants flopping with the weight of the flowers. For smaller-flowered dahlias, you can put in bamboo canes (say at the four corners) and make a surrounding support basket with twine. Dwarf bedding dahlias won’t need staking.
Apply granular, general purpose feed at planting time. Liquid feed at fortnightly intervals from early July to early September with a high-potassium feed, like tomato feed, to boost flowering. In summer containers, feed as you do your other container plants, usually weekly.
As flowers fade, deadhead them, cutting back the stems to a leaf joint. You will find older flowers have tatty petals at the back. Deadheading regularly (weekly) will encourage plants to produce more flowers.