Hypericum coris

RHS Plant Profile

heath-leaved St John's wort

Alpine Rockery Shrubs

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A mound-forming evergreen sub-shrub to a height of 20cm, with spindly stems bearing fine linear green leaves and clusters of deep yellow flowers in summer

Position

Full sun

Soil Types

Sand, Loam, Chalk

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.1-0.5 metres
Max Height: 0.1-0.5 metres

Growing Conditions

Sand Loam Chalk

Moisture: Well–drained or Moist but well–drained
pH: Neutral or Alkaline

Position

Full sun

Aspect: West–facing or South–facing
Exposure: Exposed or Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H5
Drought Resistance: Yes

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Hypericaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Bushy, Clump forming
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: Alps to N Italy

How to Grow

Cultivation

Grow in well-drained soil in full sun. Ideal for rock garden, gravel and scree gardens. Avoid exposed areas with cold, drying winds

Propagation

Propagate by seed in autumn or semi-ripe cuttings in summer

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Gravel garden
Mediterranean climate plants
Patio and container plants
Rock garden
Wildlife gardens
Low Maintenance
Wall side borders
Banks and slopes
Flower borders and beds
Ground cover

Pruning

Pruning group 8

Pests

Generally pest-free

Diseases

May be susceptible to a rust