Star-shaped dahlias opening in light, sculptural forms
Orchid dahlias
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Orchid dahlias
Orchid dahlias are defined by their narrow, rolled petals, which create an open, star-shaped flower with a much lighter structure than fully double dahlias. The petals often curve or twist gently as they open, giving orchid dahlias a distinctive sense of movement through the border. Their finer form works especially well among grasses and looser perennials, where each flower can sit clearly without making the planting feel too dense.
These star-shaped dahlias flower from midsummer into autumn, producing fresh stems as older blooms are cut or deadheaded. Plant the tubers in spring after the risk of frost has passed, choosing a sunny position in fertile, well-drained soil. Taller orchid dahlia varieties may need support as they develop, while the slender flower stems are also useful for cutting, particularly in arrangements where a more open dahlia shape is needed between fuller blooms.
Orchid dahlias come into their own when shape matters as much as colour. Repeat one variety through a mixed border to create rhythm, or combine several shades so the shared flower form holds the planting together. Their star-like flowers also contrast naturally with pompon, ball and decorative dahlias, giving a dahlia border more variation without losing cohesion. In colder UK gardens, lift and store the tubers frost free over winter, ready to return when the soil warms again in spring.
