Floss Flower (Ageratum houstonianum ) | Annuals & Biennials | Plants

Floss Flower

Ageratum houstonianum

Common Name: Floss Flower
Genus: Ageratum
Species: houstonianum

The ancient Greek translation of Ageratum refres to how the flowers keep their fresh appearance for a long period of time and rarely look spent.

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Category: Annuals & Biennials

Height: 0.25 m (25 cm)
Spread: 0.25 m (25 cm)

Hardiness: Half-Hardy
Growth Rate: Average
Flowering Period: June to September
Long Flowering Period
Foliage Type: Deciduous
Foliage Colour: Green
Flower Colour: Blue, Purple, Pink, White
Sun/Shade: Full sun
Soil Type: Normal/Loam
Soil Moisture: Moist, but well drained
Features: Good for wildlife, Suitable for growing in containers, Long flowering period

There are many cultivars of Ageratum houstonianum.

These compact half-hardy annuals usually have blue or violet-blue pom-pom like flowers throughout summer and into early autumn. There are also white and pink cultivars of Ageratum houstonianum.

Regular feeding and watering in hot summers, and regular dead-heading help to prolong the flowering period of these plants. The flowers are attractive to butterflies, making cultivars of Ageratum houstonianum suitable for a wildlife garden. These plants are particularly useful for edging formal bedding schemes.