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Herbaceous Perennial

Aster koraiensis

Korean aster

A rhizomatous perennial with an upright habit with dark green lanceolate leaves and daisy-like relatively large flowerheads, which have a ring of lavender ray florets surrounding a central cluster of golden yellow disc florets produced from early until mid-autumn. Attractive to pollinating insects

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Ultimate height

0.5–1 metres

Time to ultimate height

1–2 years

Ultimate spread

0.1–0.5 metres

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, Columnar upright
Genus: Aster can be perennials, annuals or subshrubs, mostly with narrow leaves, and solitary or clustered, daisy-like flowers
Name status: Correct
Plant range: Korea

How to grow

Cultivation

Grow in well-drained, moderately fertile soil in an open, sunny position. See aster cultivation

Propagation

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

Suggested planting locations and garden types

Cottage and informal garden
Cut flowers
Flower borders and beds
Underplanting of roses and shrubs
Wall side borders

Pruning

Deadhead spent flowers to tidy, cut back stem close to the ground in late autumn or beginning of spring before the new shoots emerge

Pests

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

Diseases

May be susceptible to Fusarium wilt, Powdery mildews and grey moulds

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