Kalimeris mongolica 'Antonia'

RHS Plant Profile

double Japanese aster 'Antonia'

Herbaceous Perennial

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A clump-forming perennial about 1-1.2m high, with upright, branching stems and deeply divided, stalked mid-green leaves. Clusters of small daisy-like mauve flowers with yellow centres, are produced from mid to late summer and well into autumn

Position

Full sun, Partial shade

Soil Types

Clay, Loam, Sand

Max Height

1-1.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.5-1 metres
Max Height: 1-1.5 metres

Growing Conditions

Clay Loam Sand

Moisture: Moist but well–drained
pH: Acid or Alkaline or Neutral

Position

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): H7

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Asteraceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Clump forming
Genus: Kalimeris are deciduous perennials with smooth, narrow, rounded, toothed or lobed leaves. The daisy-like flowers have white, pink or purple ray florets and yellow centres, and are carried singly or in flat-topped clusters
Name Status: Accepted

How to Grow

Cultivation

Grow in moderately fertile, moist but well-drained soil in full sun or light shade. Stake tall plants in early spring, see staking perennials. See aster cultivation for further advice

Propagation

Propagate by division in spring or root softwood basal cuttings in spring; division can be carried out every third year to maintain vigour

Suggested planting locations and garden types

City and courtyard gardens
Coastal
Cottage and informal garden
Prairie planting
Cut flowers
Flower borders and beds

Pruning

Cut down flowered stems to ground level once flowering has finished or leave the seedheads and stems in place for wildlife and winter interest

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