Botanical Name: Ageratum houstonianum
Common Name: Ageratum, Floss flower  
Plant photo of: Ageratum houstonianum
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Water Saving Tip:

Replace turf with groundcovers, trees, and shrubs. If you have areas where no one uses the grass, patches that do not grow well, or a turf area too small to water without runoff, consider replacing the turf with water-efficient landscaping.

  • Anatomy

  • Culture

  • Design

Plant Type



Height Range

Under 1', 1-3'


Flower Color

Blue, Lavender, Pink, Red, Violet, White


Flower Season

Spring, Summer


Leaf Color

Green, Light Green


Bark Color



Fruit Color



Fruit Season



Full, Half



Medium, High


Growth Rate

Fast, Moderate


Soil Type



Soil Condition

Rich, Well-drained, Moist


Soil pH

Acid, Neutral


Adverse Factors


Design Styles

English Cottage, Formal


Accenting Features

Showy Flowers


Seasonal Interest

Spring, Summer


Location Uses

Raised Planter


Special Uses

Container, Cut Flowers


Attracts Wildlife


Information by: Stephanie Duer
Photographer: Steve Mullany
  • Description

  • Notes

Floss flower is a frost-tender annual that blooms from late spring to frost. The Flowers are fluffy and look like clusters of little balls at the ends of the flower stems. Size depends on variety, and range from 4 to 30 inches tall. Flower colors are typically in the pastel shades, and include various shades of blue, pink, red, white, and bicolor. Leaves are typically rounded, hairy, slightly quilted, and soft green. Taller varieties make good cut flowers.
Ageratum prefer rich, well-amended soil that receives consistent watering. Though full sun, in our hot summers they will do well with some mid-day or late-day shade. Overhead watering may cause powdery mildew. Well suited to containers.