Conoclinium coelestinum 'Cori'

Synonyms

Eupatorium coelestinum 'Cori'

Herbaceous Perennial

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

Position

Full sun, Partial shade

Soil Types

Chalk, Clay

Max Height

0.5-1 metres

Max Spread

0.5-1 metres

Size

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

Growing Conditions

Chalk Clay

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

Position

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): H4

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Asteraceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Bushy
Genus: A genus of four species of herbaceous perennial flowering plants loved by pollinators, native to North America, with green foliage and flat clusters of fuzzy-looking flowers in hues of blue, lavender, or pinkish-white
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