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Ageratum houstonianum 'Blue Horizon'


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Key information

Plant type

Half-hardy annual

Flower colour





Half hardy

Skill level


photo by Frederic Didillon, copyright GAP Photos (317095)

Plant details

A fast-growing, Mexican annual which forms a compact, mound and has a uniform growing habit. It has downy leaves and purple-blue, weather-resistant flower-heads on long, sturdy stems. The flowers are good for bedding and cutting and can be used in both fresh and dried displays.

Family: Asteraceae

Genus: Ageratum

Species: houstonianum

Cultivar: Blue Horizon

Plant type: Half-hardy annual

Flower colour: Blue

Foliage colour: Mid-green

Feature: Flowers

Sun exposure: Full sun

Soil: Well-drained/light, Clay/heavy, Acidic, Chalky/alkaline

Hardiness: Half hardy

Skill level: Beginner

Height: 45cm

Spread: 30cm

Time to plant seeds: February to April

Flowering period: July to September

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