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Herbaceous Perennial

Clematis integrifolia from Lake Baikal, Russia

A bushy, deciduous perennial with an informal habit, reaching a height of around 60cm, with dark green leaves. Masses of large, lavender-blue bell-shaped flowers with upturned petals, appear from late May through to September

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Ultimate height

0.5–1 metres

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Chalk

Clay

Loam

Sand

Moisture

Moist but well–drained, Well–drained

pH

Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

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)

Botanical details

Family: Ranunculaceae
Native to GB / Ireland: No
Foliage: Deciduous
Habit: Bushy
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

How to grow

Cultivation

Plant herbaceous clematis in moisture-retentive, well-drained soil in full sun, Ideal for ground cover or as an individual plant in a rock garden. See clematis cultivation

Propagation

Propagate by seed. Will germinate easily at room temperature; sow at a shallow depth in spring, summer or early autumn. Propagate by division after it has become established

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Patio and container plants
Rock garden
Low Maintenance
Flower borders and beds
Garden edging
Ground cover

Pruning

Pruning (clematis) group 3 - can be cut back hard in February

Pests

May be susceptible to aphids

Diseases

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

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