United Kingdom Dahlia Classification

Sizes

Giant-flowered usually over 254 mm. (10 inches) in diameter.

Large-flowered usually between 203 mm. (8 inches) and 254 mm. (10 inches) in diameter.

Medium-flowered usually between 152 mm. (6 inches) and 203 mm. (8 inches) in diameter.

Small-flowered usually between 102 mm. (4 inches) and 152 (6 inches) in diameter.

Miniature-flowered not usually exceeding 102 mm. (4 inches) in diameter.



Ball Dahlias

Small Ball dahlias usually between 102 mm. (4 inches) and 152 mm. (6 inches) in diameter.
Miniature Ball dahlias usually between 52 mm. (2 inches) and 102 mm. (4 inches) in diameter.


Pompon dahlias not exceeding 52 mm. (2 inches) in diameter.