Dahlias

Single-Flowered Dahlias have one ring of ray florets and a central group of disc florets. The height attained is eighteen inches to two feet and the blooms are up to four inches. Collerette Dahlias have one outer ring of flat ray florets plus an inner ring of collar florets and a central group of disc florets. The height is two to four feet and the blooms are up to four inches. Paeony-Flowered Dahlias have two or more rings of flattened ray florets and a central group of disc florets. The height is two to four feet and the blooms are up to five inches. Decorative Dahlias are fully double with flat ray florets that are broad and blunt-ended. The height achieved is three to five feet and the blooms are three to ten inches or more. Anemone-Flowered Dahlias have one or more rings of ray florets and a central group of tubular florets. The height is two to three feet and the blooms are up to four inches.

Ball Dahlias are fully double, and often flattened. The involute ray florets are blunt or round-ended. The height is three to four feet and the blooms are three to six inches. Miscellaneous Dahlias are flower forms not belonging to the groups described on this page. There are Orchid-flowered Dahlias, incurved Chrysanthemum-flowered Dahliahs and Star Dahlias which are now rarely seen. Pompon Dahlias are fully double and globe-shaped. The involute ray florets are blunt or round-ended. The height is three to four feet and the blooms are less than two inches. Cactus Dahlias are fully double with revolute ray florets which are narrow and pointed. The height is three to five feet and the blooms are three to ten inches or more. Semi-Cactus Dahlias are fully double with pointed ray florets which are revolute for half their length or less. They are broader than Cactus Dahlia petals and attain a height of three to five feet. The blooms are three to ten inches or more.