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Alpine Rockery

Hypericum olympicum f. minus 'Sulphureum'

A dwarf sub-shrub to 20cm tall, forming a neat mound of grey-green leaves. From mid- to late summer, at the stem tips, it produces pale yellow flowers with a central tuft of golden yellow stamens. Well suited to a rock garden or alpine trough

Synonyms

Hypericum polyphyllum 'Sulphureum'
Hypericum polyphyllum 'Citrinum'

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Plant nurseries
4 suppliers

Ultimate height

0.1–0.5 metres

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Chalk

Clay

Loam

Sand

Moisture

Well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun

Aspect

South–facing or West–facing

Exposure

Sheltered

Drought resistance

Yes

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)

Botanical 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

Grow in moderately fertile, well-drained soil in full sun. Protect from excessive winter wet

Propagation

Propagate by softwood cuttings or semi-ripe cuttings

Suggested planting locations and garden types

City and courtyard gardens
Patio and container plants
Rock garden

Pruning

See pruning group 1 or pruning group 6

Pests

Generally pest-free

Diseases

May be susceptible to a rust and honey fungus (rarely)

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