Plants > Perennials

giant knapweed

Centaurea macrocephala

Pollinator Friendly

Genus: Centaurea
Family: Asteraceae
Common Names: great-headed centaury

About this plant

C. macrocephala is a large, clump-forming perennial with simple or lobed leaves and yellow flower-heads 5cm across opening in summer from brown buds

Growing Information

Height

1-1.5 Metres

Spread

0.1-0.5 Metres

Hardiness

H7

Foliage

Deciduous

Growing Conditions

Sunlight

Full SunPartial Shade

Soil

ClayChalkLoamSandy

pH

Acid

Not Currently Available

This plant is not currently stocked at any garden centres on our platform.

Alkaline

Neutral

Moisture

Poorly Drained

Aspect

East FacingWest FacingNorth FacingSouth Facing

Exposure

ShelteredExposed

Care Guide

Cultivation

Best grown in moist but well-drained soil in sun or partial shade

Pruning

Deadhead regularly to prolong flowering

Propagation

Propagate by seed sown in pots in a cold frame in spring or propagate by division in spring or autumn

Pests

Generally pest free

Diseases

May be affected by powdery mildews

Garden Uses

Uses

Flower BordersGround CoverRock GardenBanks Slopes

Planting Places

IndoorOutdoor

Season of Interest

SpringSummerAutumn

Size & Characteristics

Height

1-1.5 Metres

Spread

0.1-0.5 Metres

Habit

Clump Forming

Time to Full Height

Five To Ten Years