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Centaurea scabiosa

Greater knapweed

Garden

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Features

  • BloomsJuly to September
  • Height0.3m to 1.5m
  • Growth HabitBranched clump
  • Flower ColourReddish purple
  • Leaf ColourSilver-green

Description

Centaurea scabiosa (Greater knapweed). An upright tall perennial herb native to Britain. Leaves are divided into paired lobes and are toothed. Reddish purple single flowers appear in mid summer. This plant is often found in the wild in Northern Europe. STEM: Upright, branched above. ROOT: Stout, woody stock. HAIRS: Short, rough on leaves. STIPULES: Absent LEAF-STALK: Lower shorter than blade, upper absent. BRACTS: Broad around head, each with feathery, blackish tip; bristle-like between floret FLOWER STALK: Absent; long under heads. SEPALS: A ring of hairs. PETALS: 5, joined, tubular, lobes slightly unequal. STAMENS: 5, joined into tube. STIGMA: 1, 2-lobed; style long. OVARY: 1, below petals, 1-celled. SEEDS: 1, not released.

Characteristics

Perennial, Herbaceous

Origin

Britain

Interest and use

Wildflower/meadow.

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Needs

  • LightPart shade
  • HardinessFully hardy (min -35°C)
  • SoilHeavy, Light, Medium, Poor quality
  • Soil pH5.0 to 6.0
  • WaterSemi-moist

Cultivation

They are fully hardy and will require sun, and will grow in any well drained soil, even poor soil.

Propagation

You can propagate by seeds or division in the autumn or spring.

Pests, diseases or disorders

Powdery mildew may be problem.

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