• 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

Hypericum perforatum

Perforate St John's wort

Perforate St John's wort

© � RHS 2003

  • Other common names Perforate St John's wort
    Cammock

    Common St John's wort
    Devil chaser
    Devil's flight
    Devil's scourge
    God's wonder plant
    Herb John
    Human blood
    Klamath weed
    Penny John
    Rosin rose
    St Columba's flower

    see more
  • Genus Hypericum can be annuals, perennials, shrubs or trees, evergreen or deciduous, with usually paired leaves and showy yellow flowers with prominent stamens, followed by capsules, occasionally berry-like

  • Family Hypericaceae / Hypericaceae

  • Species H. perforatum is an upright perennial with small, ovate leaves and terminal clusters of star-shaped yellow flowers 1.5cm across

  • Plant range Europe, N Africa, SW Asia

Characteristics

  • Foliage Deciduous

  • Habit Bushy

  • Toxicity Ingestion may cause severe discomfort

Colour

Sunlight

  • Full Sun

  • Partial Shade

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

  • Exposure Exposed or Sheltered

Soil

  • Chalk

    Chalk

  • Chalk

    Clay

  • Chalk

    Sand

  • Chalk

    Loam

  • MoistureWell-drained, Moist but well-drained

  • SoilChalk, Clay, Sand, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height

    0.5-1 metres

  • Ultimate spread

    0.1-0.5 metres

  • Time to ultimate height

    2-5 years

How to grow

Cultivation Grows well in moist but well-drained soil. Ideal for wildflower garden or in mixed border

Propagation Propagate by seed, division or take softwood cuttings

Suggested planting locations and garden types Low Maintenance Banks and Slopes Wildflower meadow Wildlife Gardens

How to care

Pruning No pruning required

Pests Generally pest free

Diseases Generally disease free

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