Clematis × diversifolia 'Blue Boy' (I)

Synonyms

Clematis × eriostemon 'Blue Boy'
Clematis 'Blue Boy'

Herbaceous Perennial

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Deciduous, clump-forming herbaceous (non-climbing) clematis, to about 2m high, with pinnately divided green leaves. Scrambling stems are topped with widely bell-shaped, pale violet blue flowers to 7.5cm across, with recurved tips and wavy edges, from midsummer to early autumn

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

1.5-2.5 metres

Max Spread

1-1.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 1-1.5 metres
Max Height: 1.5-2.5 metres

Growing Conditions

Chalk Clay Loam Sand

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

Position

Full sun

Aspect: 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

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

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: Accepted
Horticultural Group

Horticultural Classification Codes

Horticultural Classification Codes are often given to genera which have a large number of species or cultivars. They are used to categorise cultivated plants based on specific, shared characteristics such as shape, colour, size or flowering time, and can be displayed as letters or numbers

For example:
Dahlia ‘Sunset Kate (Sin) = Single flower
Rosa ‘Marigold’ (HT) = Hybrid Tea: Integrifolia Group clematis are woody-based subshrubs with non-climbing or semi-climbing herbaceous stems, and bell-shaped or flat flowers on the current year's growth, in summer and early autumn

How to Grow

Cultivation

Plant herbaceous (non-climbing) clematis at soil level in moisture-retentive, well-drained soil in full sun, with the roots and base of the plant in shade. Ideal for growing through plants in the herbaceous border or through low shrubs for support. See clematis cultivation

Propagation

Propagate by division or take basal softwood cuttings of herbaceous clematis in spring

Suggested planting locations and garden types

Cottage and informal garden
Flower borders and beds

Pruning

See clematis pruning: group three. Cut back hard before growth begins in early spring

Pests

May be susceptible to aphids. Cutworms and voles may cut young stems

Diseases

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