About
Ageratina altissima is a robust herbaceous perennial that grows up to 1.7 meters in height. It features brown stems and grey-green leaves that resemble those of stinging nettles. During the summer and early autumn, it produces clusters of small, white flowers arranged in umbels that persist for an extended period.
About the genus
Ageratina consists of shrubs or herbaceous perennials characterized by their opposite leaves and clusters of small tubular flowers arranged in corymbs.
Growing conditions
- Sunlight
- Partial shade
- Soil type
- Chalk, Clay, Loam
- Soil pH
- Alkaline, Neutral
- Soil moisture
- Moist but well-drained, Poorly-drained
- Aspect
- East-facing, West-facing
- Exposure
- Sheltered
- UK hardiness
- H5
Plant details
- Plant type
- Herbaceous Perennial
- Habit
- Bushy
- Foliage
- Deciduous
- Height
- 1.5-2.5 metres
- Spread
- 0.5-1 metres
- Time to full height
- 2-5 years
- Suggested uses
- Wildlife gardens, Cottage and informal garden
- Native to
- North America
Care notes
- Cultivation
- The ideal site is a moist, alkaline soil in partial shade; frost may damage new shoots
- Pruning
- Cut back faded flower stems to base
- Propagation
- Propagate by seed or division, in spring
- Pest resistance
- May be susceptible to slugs and aphids
- Disease resistance
- Generally disease-free