The Disbud Chrysanthemum has one single large flower per stem produced by removing all side buds when plant was young.
There are two types of Disbuds: Spiders and Cremons. A Spider is distinguished by its tubular petals. Any disbud without this characteristic is a Cremon.
Disbuds are used as a focal flowers in arrangements and bouquets. The average size of a Disbud bloom is 7-9cm in diameter.
Chrysanthemum sp. is the genus of all pompons, mums, and disbuds.
Source: Heidenreich’s Flowers