Not the plant you're looking for? Search over 300,000 plants

Herbaceous Perennial

Conoclinium coelestinum 'Cori'

A compact, vigorous, rhizomatous deciduous herbaceous perennial with oval-shaped, dark green toothed foliage and showy, fluffy light blue-purple flowers appearing in the summer through to autumn. Prefers a moist to boggy location alongside ponds and streams. May become a nuisance if not kept in check

Synonyms

Eupatorium coelestinum 'Cori'

Save to My plants

Ultimate height

0.5–1 metres

Time to ultimate height

1–2 years

Ultimate spread

0.5–1 metres

Chalk

Clay

Moisture

Moist but well–drained, Poorly–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

East–facing or North–facing or South–facing or West–facing

Exposure

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: Bushy
Name status: Accepted

How to grow

Cultivation

Grow in very moist to wet soil in sun or partial shade. Plants may require support. Plants have the potential to become a nuisance if not kept in check, but drier soils will slow growth

Propagation

Propagate by stem cuttings

Suggested planting locations and garden types

Cottage and informal garden
Coastal
Banks and slopes
Flower borders and beds

Pruning

No pruning required

Pests

May be susceptible to leaf miner and aphids

Diseases

May be susceptible to powdery mildews

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.