• AGM plants

    AGM plants have been through a rigourous trial and assessment programme. They are:

    • Excellent for ordinary use in appropriate conditions
    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases

Echinacea purpurea

Black samson

Black samson

© � RHS 1985

  • Other common names Black samson
    Hedgehog cone flower

    Purple cone flower
    Purple daisy
    Eastern purple coneflower

    see more
  • Synonyms Rudbeckia echinacea purpurea
    Rudbeckia purpurea

  • Genus Echinacea are erect, clump-forming rhizomatous perennials with simple or pinnately lobed leaves and solitary, long-stalked daisies with prominent conical central disks and often drooping ray florets; attractive to butterflies

  • Family Asteraceae / Asteraceae

  • Species E. purpurea is an upright perennial with coarsely hairy, ovate or lance-shaped leaves and solitary flower-heads to 12cm across with slightly reflexed, light purple rays and brown central disk

  • Plant range C&E North America


  • Foliage Deciduous

  • Habit Clump-forming



  • Full Sun

  • Partial Shade

  • Aspect South-facing or East-facing or West-facing

  • Exposure Exposed or Sheltered


  • Chalk


  • Chalk


  • Chalk


  • MoistureWell-drained

  • SoilSand, Loam, Chalk

  • pHAcid, Alkaline, Neutral


  • Ultimate height

    1-1.5 metres

  • Ultimate spread

    0.1-0.5 metres

  • Time to ultimate height

    2-5 years

How to grow

Cultivation Grow in deep, well-drained, humus-rich soil ideally in full sun although they can tolerate some shade

Propagation Propagate by seed sown at 13�C in spring. Propagate by division in spring or autumn although they resent a lot of disturbance. Propagate by root cuttings from late autumn to early winter.

Suggested planting locations and garden types Flower borders and beds Cut Flowers Cottage & Informal Garden Wildflower meadow Wildlife Gardens Prairie Planting

Advertise here