| Scientific Name: | Ageratum houstonianum |
| Common Name: | floss flower |
| Family Name: | Asteraceae |
| Origin: | Central America, Mexico |
| Hardiness Zone: | Zone 8b: (-9.4 to -7 °C) |
| Plant Type: | Annual, Flowering cut plant |
| Mature Size: | 0.2 - 0.4m x 0.1 - 0.3m (height x width) |
| Habit: | Spreading, Upright |
| Form: | Vase |
| Texture: | Medium - fine |
| Landscape Uses: | Bedding plant, Container planting, Rock garden |
| Exposure: | Full sun only if soil kept moist, Part sun/part shade |
| Soil or Media: | Well-drained |
| Leaves: | Simple, Opposite, Soft flexible, Pinnate venation, Pubescent, Ovate, Ciliate, Crenate, Dentate, Serrate |
| Flowers: | Head (capitulum), White, Blue, Violet, Purple, Pink, Jul-Aug-Sep-Oct |
| Fruit: | Cypsela (achene + calyx), Brown, Oct-Nov |
| Key ID Features: | |
| Habit bushy, cultivars 20 to 1m tall; leaves simple, ovate 3-5cm long x 2-4cm wide; flower heads 4-7(-15)mm wide, 6-15(-70) in a cymose-corymb-like arrangement, fluffyness due to long branched style branches, violet to blue, pink to purple, or white, Jul-Oct. | |