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Centaurea aspera

Rough star thistle

Garden

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Features

  • BloomsApril to September
  • Height0.3m to 0.5m
  • Growth HabitIrregular bushy
  • Flower ColourPurple
  • Leaf ColourGreen-grey

Description

Centaurea aspera (Rough star thistle). This species will produce leaves that are linear, pinnatifid and grey-green. The flowers are single purple blooms. The whole plant will grow to about 50cm tall.

Characteristics

Annual, Perennial or Biennial, Shrub or Herbaceous

Origin

Europe, Med, Asia, Australia

Interest and use

Grown for the flower heads that each have a thistle like centre surrounded by a ring of slender ray petals. Suitable for coastal conditions.

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Needs

  • LightFull sun
  • HardinessFrost hardy (min -5°C)
  • SoilWell drained
  • Soil pH5.0 to 6.0
  • WaterSemi-moist

Cultivation

Grow in well-drained soil, with a sunny position.

Propagation

You will need to sow the annual seeds in the spring.

Pests, diseases or disorders

Watch out for powdery mildew.

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