Chrysanthemums, often called mums or chrysanths, are of the genus (Chrysanthemum) constituting approximately 30 species of perennial flowering plants in the family Asteraceae which is native to Asia and northeastern Europe.
Chrysanthemums are broken into two basic groups, Garden Hardy and Exhibition. Garden hardy mums are new perennials capable of being wintered over in the ground in most northern latitudes. Exhibition varieties are not usually as sturdy. Garden hardies are defined by their ability to produce an abundance of small blooms with little if any mechanical assistance (i.e., staking) and withstanding wind and rain. Exhibition varieties on the other hand require staking, over-wintering in a relatively dry cool environment, sometimes with the addition of night lights.
The name Chrysanthemum is derived from the Greek words, chrysos (gold) and anthemon (flower). The Chrysanthemum flowers bloom in various forms, and can be daisy-like, decorative, pompons or buttons. Chrysanthemum blooms come in a huge variety of shapes and sizes and in a wide range of colors. In addition to the traditional yellow, other popular colors are white, purple, and red.
The genus once included more species, but was split several decades ago into several genera, putting the economically important florist's chrysanthemum in the genus Dendranthema. The naming of the genera has been contentious, but a ruling of the International Code of Botanical Nomenclature in 1999 changed the defining species of the genus to Chrysanthemum indicum, restoring the florist's chrysanthemum to the genus Chrysanthemum.
Chrysanthemums thrive in fertile, well-drained soil and full sunlight. They grow from cuttings or root divisions. They are either annual, lasting only one year, or perennial continuing to live from year to year. Gardeners like to grow chrysanthemums because of their variety of size, shape and color. The 3000 varieties in cultivation may be divided into two main types those that are cultivated in a greenhouse and forced for winter bloom and hardy varieties that grow outdoors and bloom in late summer and fall. All chrysanthemums bloom outdoors if they are protected from frost.
The only species of economic importance are certain forms of pyrethrum, Chrysanthemum coccineum. Their flower heads are the source of pyrethrum powder, an insecticide.
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