Dahlia 'Bumble Rumble' – Collarette Dahlia

Start tubers indoors in pots from early April to get a head start, then plant out in late May once all danger of frost has passed. Choose a sunny spot with rich, well-drained soil and set each tuber 5–7 cm deep with the eyes facing upward, spaced 40–50 cm apart. Stake early — the hollow stems can snap in summer wind. In the Baltic climate, dahlias will not survive winter in the ground: lift the tubers after the first frost blackens the foliage, let them dry, and store in a cool, frost-free place until spring. Equally happy in large containers on a sunny terrace.

Collarette dahlias are among the best dahlias for wildlife — their open form gives bees and butterflies easy access to pollen and nectar, unlike the densely petalled ball or decorative types. For the vase, cut in the cool of the morning when flowers are about three-quarters open; plunge stems straight into deep cold water and expect 5–7 days of vase life. Pairs beautifully with softer, calmer perennials to create lively focal points in mixed borders.