Hypericum tetrapterum
square-stalked St John's wort
An erect perennial to 70cm tall, with square stems, winged at the corners. In late summer to early autumn it produces domed clusters of yellow flowers to 1cm across. A British native wildflower common on damp grassland
Synonyms
Hypericum quadrangulum L.
Size
Ultimate height
0.5–1 metresTime to ultimate height
1–2 yearsUltimate spread
0.1–0.5 metresGrowing conditions
Moisture
Moist but well–drained, Poorly–drainedpH
Acid, Alkaline, NeutralColour & scent
| Stem | Flower | Foliage | Fruit | |
| Spring | Green | |||
|---|---|---|---|---|
| Summer | Yellow | Green | ||
| Autumn | Yellow | Green | ||
| Winter |
Position
- Full sun
- Partial shade
Aspect
East–facing or South–facing or West–facing
Exposure
Exposed or Sheltered Hardiness
H6Botanical details
- Family
- Hypericaceae
- Native to the UK
- Yes
- Foliage
- Deciduous
- Habit
- Spreading branched
- Potentially harmful
- Fruit are ornamental - not to be eaten. Wear gloves and other protective equipment when handling. Pets: Fruit are ornamental - not to be eaten - see the HTA guide to potentially harmful plants for further information and useful contact numbers
- 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
- Europe, SW Asia
How to grow
Cultivation
Grow in any poor to moderately fertile soil that does not dry out
Propagation
Propagate by seed
Suggested planting locations and garden types
- Wildflower meadow
- Wildlife gardens
Pruning
No pruning required
Pests
Generally pest-free
Diseases
May be susceptible to a rust and honey fungus (rarely)
Get involved
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