square-stalked St John's wort
Also known as: hard hay; spotted St John's wort; St Peter'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
Scientific classification
- Species
- square-stalked St John's wort (Hypericum tetrapterum)
- Genus
- Hypericum
- Family
- Hypericaceae
- Fruit are ornamental - not to be eaten. Wear gloves and other protective equipment when handling
- Toxicity
- Herbaceous Perennial
- Plant type
- 0.5-1 metres
- Height
- 0.1-0.5 metres
- Spread
- Information to be completed
- Foliage
- Columnar upright
- Habit
- Spring · Summer · Autumn
- Season of interest
- Full sun · Partial shade
- Sunlight
- Information to be completed
- Ideal temperature
square-stalked St John's wort pictures
Distribution of square-stalked St John's wort
Distribution map
Europe, Southwestern Asia
Information to be completed
Culture
Information to be completed
Toxicity
Fruit are ornamental - not to be eaten. Wear gloves and other protective equipment when handling
Quick identification of square-stalked St John's wort
Information to be completed
square-stalked St John's wort care guide
- Moderate regular watering, allowing brief slight drying between soakings
- Watering
- Full sun · Partial shade
- Sunlight
- Information to be completed
- Ideal temperature
Watering
Moderate regular watering, allowing brief slight drying between soakings
Fertilizing
FertilizingBalanced perennial feed every four weeks from spring through summer
Pruning
PruningNo pruning required
Propagation
PropagationPropagate by seed
Growing
GrowingGrow in any poor to moderately fertile soil that does not dry out
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Information to be completed
Common pests and diseases
Diseases
May be susceptible to a rust and honey fungus (rarely)
Pests
Generally pest-free
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