Floss Flower, Ageratum, has small, fluffy, blue button-like flowers add color all season but especially in the fall. It attracts birds, butterflies, and hummingbirds. It continuously blooms for a long time. No dead heading needed. It is tolerant of heat. It is native to North America. Excellent choice for Sunnyvale gardens.


Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Ageratum (ad-jur-RAY-tum) (Info)
Species: houstonianum (hoos-toh-nee-AH-num) (Info)

Category: Annuals

Height: 6-12 in. (15-30 cm)

Spacing: 9-12 in. (22-30 cm)

Hardiness: Not Applicable

Sun Exposure: Full Sun

Danger: Seed is poisonous if ingested. Parts of plant are poisonous if ingested. All parts of plant are poisonous if ingested. Handling plant may cause skin irritation or allergic reaction. Plant has spines or sharp edges; use extreme caution when handling. Pollen may cause allergic reaction

Bloom Color: Pale Pink, Blue-Violet, Violet/Lavender, Purple, White/Near White

Bloom Time: Late Summer/Early Fall, Mid Fall, Late Fall/Early Winter

Foliage: Herbaceous


Other details: This plant is attractive to bees, butterflies and/or birds. Flowers are fragrant

Average Water Needs; Water regularly; do not overwater

Self-sows freely; deadhead if you do not want volunteer seedlings next season


Soil pH requirements: 5.6 to 6.0 (acidic); 6.1 to 6.5 (mildly acidic); 6.6 to 7.5 (neutral)

Patent Information: Non-patented

Propagation Methods: From seed; sow indoors before last frost

Seed Collecting: Allow seedheads to dry on plants; remove and collect seeds

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