There are 14 different types of Dahlias, however this show concentrates on the following classes Decorative, Pompom & Cactus or Semi-cactus
Other classes of Dahlia should be entered under class 94 "Stems of one variety of flowers not mentioned above"
Good: Bloom fresh and clean, all florets intact, firm and without blemish or defect, Colour(s) clear and well defined and either consistent or evenly shaded or tipped throughout the bloom.
For info: Revolute petals curl outwards down their length away from the center of the flower. Involute petals curl outwards down their length away from the center of the flower.
Single, Anemone or Collette Dahlia
Single Dahlia: Have blooms with a single outer ring of florets, with centre forming a disc
Anemone flowered Dahlia: One or more outer rings of generally flattened florets surrounding a disc of tubuler florets and showing no central disc
Collerette Dahlia: A single outer later of generally flat florets, which must overlap, a smaller ring of florets surround centre disc.
Decorative Dahlia Have fully double blooms showing no disc, petals generally are broad and flat, the florets may be involute for no more than 75% of their length
Have fully double spherical blooms of miniature size. (not to exceed 100mm in diameter)
Cactus or Semi-cactus Dahlia
Both have fully double blooms, On Cactus Dahlia, the ray floretets are usually pointed, narrow and revolute for 65% or more of their length, while semi cactus florets are between 25% and 65% of their length.