Hypericum olympicum f. uniflorum 'Citrinum'
St John's wort 'Citrinum'
A deciduous dwarf shrub with upright stems bearing small, ovate, grey-green leaves, and small terminal clusters of pale lemon-yellow flowers to 3.5cm wide in summer
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Size
Ultimate height
0.1–0.5 metresTime to ultimate height
2–5 yearsUltimate spread
0.1–0.5 metresGrowing conditions
Moisture
Moist but well–drained, Well–drainedpH
Acid, Alkaline, NeutralColour & scent
| Stem | Flower | Foliage | Fruit | |
| Spring | Green Grey Silver | |||
|---|---|---|---|---|
| Summer | Yellow | Green Grey Silver | ||
| Autumn | Green Grey Silver | |||
| Winter |
Position
- Full sun
- Partial shade
Aspect
South–facing or East–facing or West–facing
Exposure
Exposed or Sheltered Hardiness
H4Botanical details
- Family
- Hypericaceae
- Native to GB / Ireland
- No
- Foliage
- Deciduous
- Habit
- Bushy
- 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
Accepted
How to grow
Cultivation
Grows well in moderately fertile, moist but well-drained soil full sun. It will tolerate partial shade. Ideal for a rock garden.
Propagation
Propagate by softwood cutting or semi-ripe cuttings from late spring to early summer.
Suggested planting locations and garden types
- Cottage and informal garden
- Gravel garden
- Patio and container plants
- Rock garden
- City and courtyard gardens
Pruning
Pests
Generally pest-free
Diseases
May be susceptible to a rust and honey fungus (rarely)
Get involved
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