Genus: Floss flower

Ageratum

Floss flower (Ageratum)
a-jer-AY-tum
Asteraceae
Plants in the genus Ageratum include 40 or so species of annuals, perennials, and shrubs from North and South America. Most are grown as annuals in the garden, and most form dozens of small flowerheads in the form of soft, rounded clusters in summer and fall. They are good choices for edging, bedding, or containers.
Noteworthy characteristics:  Clusters of 30 to 50 small flowerheads. Attractive to butterflies. Usually grown as annuals.
Care:  Provide full sun to part shade. Soil should be fertile and moist but well-drained.
Propagation: 

In early spring, sow seed at 61° to 64°F. Or, sow in autumn and overwinter at 50°F.

Problems: 

Southern blight, crown rot, root rot. During cool, wet weather Botrytis blight may affect plants, while rust and powdery mildew can be problems in dry summers.

Species, varieties and clutivars for genus Ageratum

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Ageratum houstonianum
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'Blue Danube' ageratum
Ageratum houstonianum 'Blue Danube'