Greatest width across the bloom, callipers held flat on the plane of the bloom, not tipped. No rounding.
| miniature | under 115 mm |
| small | 115 – 170 |
| medium | 170 – 220 |
| large | 220 – 260 |
| giant | over 260 |
Ball classes band by size and require the form to hold to the middle.
| pompon | under 52 mm, globular |
| miniature ball | 52 – 90 |
| ball | 90 – 115 |
Form is decided by the ray florets. Decorative: rays broad and flat, margins blunt or slightly involute. Cactus: rays revolute for more than half their length. Semi-cactus: revolute for less than half.
A vase of three is one exhibit. Uniformity carries as much weight as quality. Blooms face the front, plain water, no packing above the rim. Entries close at ten.