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Herbaceous Perennial

Aster ageratoides

Clump-forming perennial which grows to about 75-90cm tall, with dark green, toothed, lance-shaped leaves, and clusters of dark violet flowers with yellow centres, flowering on strong stems, over a long period from early to late autumn or early winter

Synonyms

Aster trinervius
Aster trinervius subsp. ageratoides
see moreAster trifoliatus subsp. ageratoides

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Ultimate height

0.5–1 metres

Time to ultimate height

2–5 years

Ultimate spread

0.5–1 metres

Chalk

Clay

Loam

Sand

Moisture

Moist but well–drained, Well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

East–facing or South–facing or West–facing

Exposure

Exposed or Sheltered

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical details

Family: Asteraceae
Native to GB / Ireland: No
Foliage: Deciduous
Habit: Clump forming
Genus: Aster can be perennials, annuals or subshrubs, mostly with narrow leaves, and solitary or clustered, daisy-like flowers
Name status: Correct
Plant range: Himalaya

How to grow

Cultivation

Grow in moderately fertile, well-drained soil in full sun or light shade. See aster cultivation

Propagation

Propagate by division in spring or root softwood basal cuttings in spring

Suggested planting locations and garden types

City and courtyard gardens
Coastal
Cottage and informal garden
Patio and container plants
Wildflower meadow
Cut flowers
Flower borders and beds
Underplanting of roses and shrubs

Pruning

Deadhead spent flowers to tidy, cut back stem close to the ground in late autumn

Pests

May be susceptible to leaf and bud eelworms, slugs and snails

Diseases

Asters may be susceptible to Verticillium wilt, Powdery mildews and grey moulds

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