Open-faced dahlias framed by a delicate inner collar
Collarette dahlias
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Collarette dahlias
Collarette dahlias are defined by the ring of shorter petals that sits between the broad outer petals and the open central disc. This distinctive collarette gives the flowers a lighter, more intricate form than fully double dahlias, while keeping the centre accessible to bees and other pollinators. Collarette dahlias come in a wide range of colours, often with contrasting inner petals that make the structure of each bloom especially clear.
Their more open flower shape brings a different rhythm to summer planting. Rather than forming dense blocks of bloom, collarette dahlia plants sit naturally among grasses, airy perennials and other pollinator-friendly flowers, where the exposed centres and finer proportions help the border feel less formal. Plant the tubers in spring after the risk of frost has passed, in a sunny position with fertile, well-drained soil. Taller collarette dahlia varieties may need support as growth develops, while regular deadheading encourages fresh flowers from midsummer into autumn.
The best effect comes from letting the flower form do the work. Repeat one collarette dahlia variety through a mixed border, combine several for a looser cutting patch or use them to break up larger decorative and dinnerplate flowers. Their open centres, contrasting collars and useful stem length make them a strong choice for both garden planting and the vase. In colder UK gardens, lift and store the tubers frost free once the season ends, then return them to the border when spring comes back.
