Size classifications of Dahlias
| AA (Giant) | over 10″ diameter |
| A (Large) | 8-10″ diameter |
| B (Medium) | over 6 to 8″ diameter |
| BB (Small) | over 4 to 6″ diameter |
| M (Miniature) | up to 4″ diameter |
| BA (Ball) | over 3.5″ diameter |
| MB (Miniature Ball) | over 2 to 3.5″ in diameter |
| P | up to 2″ in diameter |
| MS (Mignon Single) | up to 2″ in diameter |
| S | over 2″ in diameter |
