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ShrubsAlpine Rockery

Hypericum cerastioides

horned St John's wort

A small semi-evergreen trailing shrub reaching 20cm. It has grey-green leaves and clusters of yellow five-petalled flowers in summer

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Size
Ultimate height
0.1–0.5 metres
Time to ultimate height
2–5 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Chalk
Loam
Sand
Moisture
Moist but well–drained, Well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green Grey Silver
Summer Yellow Green Grey Silver
Autumn Green Grey Silver
Winter Green Grey Silver
Position
  • Full sun
Aspect

East–facing or North–facing or South–facing or West–facing

Exposure
Exposed or Sheltered
Hardiness
H4
Botanical details
Family
Hypericaceae
Native to the UK
No
Foliage
Semi evergreen
Habit
Trailing, Bushy
Potentially harmful
Fruit are ornamental - not to be eaten. Wear gloves and other protective equipment when handling
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

Name status

Correct

Plant range
Balkans

How to grow

Cultivation

Grow in any moist but well drained soil, in full sun

Propagation

Propagate from seed or from semi-ripe cuttings in summer

Suggested planting locations and garden types
  • Gravel garden
  • hanging basket
  • Patio and container plants
  • Coastal
  • Banks and slopes
Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.