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Herbaceous Perennial

Clematis stans

Asian clematis

A clump-forming, woody herbaceous perennial, to 1.5m high, with green leaves composed of three toothed leaflets, and tubular flowers, with a lily-of-the-valley scent, and composed of four white, off-white or pale blue sepals, 1-3cm long, which curl backwards at the tips, with cream anthers, from late summer to autumn

Synonyms

Clematis stans 'Lavallei'
Clematis kousabotan
see moreClematis heracleifolia subsp. stans

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Ultimate height

1–1.5 metres

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Chalk

Clay

Loam

Sand

Moisture

Moist but well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun

Aspect

West–facing or East–facing or South–facing

Exposure

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)

Botanical details

Family: Ranunculaceae
Native to the UK: No
Foliage: Deciduous
Habit: Clump forming
Potentially harmful: Skin irritant. Wear gloves and other protective equipment when handling. Pets (rabbits): Harmful if eaten. For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus: Clematis can be deciduous or evergreen shrubs or herbaceous perennials, mostly climbing by twining leaf-stalks, and often with showy flowers. Some have attractive fluffy seedheads in autumn
Name status: Correct
Plant range: Japan

How to grow

Cultivation

Grow in full sun in containers (at least 45cm deep and wide) or in the ground, in cool, moisture-retentive, well-drained soil, with the crown 5-8cm deep to encourage new shoots to grow from below ground level; keep the base of the plant and the roots cool and shaded by other plants or a layer of pebbles or flat stones; for more advice, see clematis cultivation

Propagation

Propagate by seed, or by internodal leaf-bud semi-ripe cuttings taken from spring to late summer, or by layering from late winter to spring

Suggested planting locations and garden types

Cottage and informal garden
Patio and container plants
City and courtyard gardens
Flower borders and beds
Wall side borders

Pruning

Clematis pruning: group three

Pests

May be susceptible to aphids, capsid bug, caterpillars, and glasshouse red spider mite; flowers may be damaged by earwigs; young shoots are vulnerable to slugs and snails; container-grown plants may be susceptible to vine weevil

Diseases

May be susceptible to honey fungus (rarely), clematis wilt and clematis slime flux

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