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Herbaceous Perennial

Boltonia asteroides var. latisquama

An aster-like perennial to about 1.5m tall, with, willowy, branched stems bearing lance-shaped finely-toothed greyish-blue to green leaves. Daisy-like, deep lilac-purple or white flowers 2-3cm across, with yellow centres appear late summer to mid-autumn

Synonyms

Boltonia latisquama

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Ultimate height

1–1.5 metres

Time to ultimate height

2–5 years

Ultimate spread

0.5–1 metres

Clay

Loam

Sand

Moisture

Moist but 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: A genus of flowering herbaceous perennial native to North America with one species native to eastern Asia. Tall stems of daisy-like flowers sit above blue-green foliage
Name status: Correct

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 seed sown in a cold frame in autumn, or propagate by division in early spring

Suggested planting locations and garden types

City and courtyard gardens
Coastal
Cottage and informal garden
Prairie planting
Wildflower meadow
Wildlife gardens
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

Generally pest-free

Diseases

May be susceptible to Powdery mildews

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