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Hypericum perforatum

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© RHS 2003

Characteristics

Plant type

Herbaceous Perennial

Habit

Bushy

Origin

Native to the UK

Toxicity

Ingestion may cause severe discomfort

Resilience

Hardiness

old H4 (hardy)

Colour

Flower

Yellow in Summer

Foliage

Green in Autumn, Spring and Summer

Size

Ultimate height

0.5-1 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

2-5 years


Preferred common name

perforate St John's wort

Family

Hypericaceae


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

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

Other common names

  • 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

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

  • South-facing, North-facing, West-facing or East-facing
  • Exposed or Sheltered

Cultivation

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

Soil

  • Well-drained or Moist but well-drained
  • Acid, Alkaline or Neutral
  • Chalk, Clay, Sand or Loam

Propagation

Propagate by seed, division or take softwood cuttings

Suggested planting locations and garden types

Low Maintenance, Wildflower meadow, Wildlife Gardens or Banks and Slopes


How to care

Pruning

No pruning required

Pests

Generally pest free

Diseases

Generally disease free