Although once referred to as Dendranthema, the florists chrysanthemum is now correctly known under its old name. There are about 40 species in the genus Chrysanthemum, mainly from East Asia. In China, where they have been cultivated for over 2,500 years, the chrysanthemum was used medicinally and for flavouring, as well as for ornament. All chrysanthemum flowers are edible, but the flavour varies widely from plant to plant, from sweet to tangy to bitter or peppery. It may take some experimentation to find flavours you like.
The flower is also significant in Japan where it is a symbol of happiness and longevity, and the royal family has ruled for 2,600 years from the Chrysanthemum Throne. The annual species are referred to as Xanthophthalmum and are mainly used for summer bedding or as fillers in borders of perennial flowers. Most chrysanthemums are upright plants with lobed leaves that can be aromatic. The many showy flowerheads, carried at the tips of strong stems, begin to bloom as the days shorten.
Florist's chrysanthemums (Chrysanthemum grandiflorum) are grouped according to form: Irregular incurved, reflexed, regular incurved, intermediate incurved, pompon, single and semi-double, anemone, spoon, quill, spider, brush or thistle, and unclassified, which is a catch-all group for blooms not yet classified or not falling into one of the existing groups. Florists chrysanthemums prefer a heavier richer soil in a sunny position, though they like a spot that offers some afternoon shade. The plants require training and trimming to produce their best flowers. Pinch back when young and disbud to ensure the best flower show. Propagate by division when dormant or from half-hardened summer cuttings.