Clematis crispa

RHS Plant Profile

marsh clematis

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Other common names

blue jasmine, curlflower, curly clematis

Synonyms

Clematis simsii Sweet

Climber Wall Shrub

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A deciduous perennial climber with dark green leaves. Masses of lightly fragranced, bell-shaped nodding pale to violet-blue flowers with crinkled edges appear from summer through until autumn. Also works well as ground cover or scrambling through other plants in a herbaceous border if left unsupported

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

1.5-2.5 metres

Max Spread

1.5-2.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 1.5-2.5 metres
Max Height: 1.5-2.5 metres

Growing Conditions

Chalk Clay Loam Sand

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

Position

Full sun Partial shade

Aspect: East–facing or South–facing or West–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): H6

Colour & Scent

Fragrance Flower

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Ranunculaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Climbing
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: SE US

How to Grow

Cultivation

Plant in a moisture-retentive, well-drained soil, with the roots and base of the plant kept cool and shaded by other plants or a layer of pebbles at the base. Plant with the crown 5-8cm deep to encourage shoots to grow from below ground level. Good for ground cover if left to scramble through a border, unsupported. See clematis cultivation

Propagation

Propagate by layering or semi-hardwood cuttings

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Climber and wall shrubs
Flower borders and beds
Ground cover
Wall side borders

Pruning

Pruning (clematis) group 3

Pests

May be susceptible to aphids, slugs, snails or caterpillars

Diseases

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