Genus: Garden mum

Chrysanthemum

Photo/Illustration: 
Chris Curless
Garden mum (Chrysanthemum)
kris-AN-theh-mum
Asteraceae
The genus Chrysanthemum encompasses a large group of plants (mainly cultivars) that are grown for their showy disc and ray flowers. The diversity of this genus is evident in both its flowerhead forms and wide range of colors. Plants may need staking in rich soil, but can be trimmed back early in the season to mitigate this. Many add valuable late-season color to the garden.
Noteworthy characteristics:  The diverse flowerhead forms range from simple to exotic. The colors vary from soothing pink to shocking lime.
Care:  Grow in full sun and moist, but well-drained soil.
Propagation: 

Best by division in autumn or early spring, but plants can also be started from seed in spring.

Problems: 

Fungal rot, gray mold, powdery mildew, white rust.

Species, varieties and clutivars for genus Chrysanthemum

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Hardy garden mum
Chrysanthemum morifolium