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We group semi-cactus and cactus dahlias together - both are fully double and vary in size from small to giant, while their "spiky" shapes mean that rain weighs them down less, so they do not need as much staking as types with heavier heads. Together, cactus and semi-cactus dahlias are among the most striking available.

Cactus dahlias have petals that are narrow at the base and that frequently curve inwards while the petals on semi-cactus dahlias are broader at the base and are typically rolled in for part of their length. For broader petalled beauties, have a look at the rest of our of dahlias.

For strong establishment and the best flowering, we recommend using the Bulb Starter Rootgrow blend.

Your Dahlias are delivered by mail order direct from our nursery, along with expert advice and friendly support, so you can give them a whirl with complete confidence.