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Clematis Blue Boy

Clematis integrifolia x viticella Blue Boy

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This medium-sized clematis, both climbing and bushy, bears a multitude of pendulous bell-shaped flowers in a light mauve-blue colour with grey undertones. The 6cm (2in) diameter flowers open to reveal a bouquet of cream stamens. It blooms abundantly in spring, and then more sporadically in summer on new shoots. It is a hardy variety and easy to grow in the sun, in any rather rich garden soil that is not too dry.
Flower size
6 cm
Height at maturity
1.80 m
Spread at maturity
1 m
Exposure
Sun, Partial shade
Hardiness
Hardy down to -20°C
Soil moisture
Moist soil
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Best planting time March, October
Recommended planting time March to May, September to November
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Flowering time May to June, August to September
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Description

Clematis 'Blue Boy' is a beautiful semi-climbing hybrid variety, adorned with hundreds of gracefully pendulous bell-shaped flowers that are both light and bright. They bloom in abundance in spring, and more sporadically during summer if the soil remains slightly moist. With its natural appearance, this clematis displays delicate foliage that perfectly complements its blue-mauve flowering. Its modest size and easy cultivation make it an ideal plant for container gardening, as well as an excellent companion for roses.

 

The genus Clematis belongs to the Ranunculaceae family. Clematis 'Blue Boy' is a horticultural creation from 1947 by Frank L. Skinner, born in Canada. This remarkable variety is the result of cross-breeding between C. integrifolia and C. viticella.

'Blue Boy' is a low-climbing perennial plant with long leafy stems reaching a length of 1.8m (6ft). The overall habit forms a slightly bushy clump about 1.2m (4ft) in height, with a similar spread. Slow to establish, the plant deeply roots itself in the soil before showing more vigorous growth in subsequent years. Each spring, numerous stems emerge from its base, bearing small leaves divided into 3 ovate to elliptical leaflets in a deep green colour. The flowers bloom abundantly in May-June, and then more sporadically throughout summer amidst the foliage. Light pruning after the first wave of flowers encourages renewed flowering, although the flowers are often smaller. They are semi-campanulate in shape and somewhat pendulous, composed of 4 slightly recurved, twisted, and undulate petals. At full bloom, they measure about 6cm (2in) in diameter and display cream-coloured stamens in their throat. The colour of the flowers is a fairly light blue with mauve and grey undertones. This clematis prefers sunny but not scorching locations.

Plant Clematis 'Blue Boy' alongside roses to accompany their flowering and fill in their bare base. Clematis represents a genus rich in diversity, with flowers of all colours, shapes, and sizes. Take advantage of their easy cultivation to give your garden a romantic and bohemian touch. The exquisite and robust Clematis 'Blue Boy' will thrive perfectly in a pot on a balcony or on a bank filled with perennial peas, variegated ivy, small-flowered periwinkles, coreopsis, and euphorbias.

Plant habit

Height at maturity 1.80 m
Spread at maturity 1 m
Growth rate normal

Flowering

Flower colour blue
Flowering time May to June, August to September
Flower size 6 cm

Foliage

Foliage persistence Deciduous
Foliage colour green

Botanical data

Genus

Clematis

Species

integrifolia x viticella

Cultivar

Blue Boy

Family

Ranunculaceae

Other common names

Origin

Cultivar or hybrid

Product reference10096811

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Planting and care

Clematis 'Blue Boy' prefers humus-rich, moist but well-drained soils. It can tolerate any properly loosened and relatively deep garden soil that is not too dry in summer. This plant can withstand short periods of drought, but lack of water will diminish flowering. It prefers partial shade and requires plenty of light to flower properly. However, this plant dreads direct and scorching sunlight, especially in hot regions. Sometimes slow to establish, it deeply roots before taking off. It is a trouble-free and long-lasting plant. It should be pruned very short every year at the end of winter.

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Planting period

Best planting time March, October
Recommended planting time March to May, September to November
Type of support Tree, Trellis

Intended location

Suitable for Meadow, Woodland edge
Type of use Border, Container, Climbing
Hardiness Hardy down to -20°C (USDA zone 6b) Show map
Ease of cultivation Amateur
Planting density 100 per m2
Exposure Sun, Partial shade
Soil pH Neutral, Any
Soil moisture Moist soil, Deep, loose, fertile.

Care

Pruning instructions Prune back heavily in late winter.
Pruning Pruning recommended once a year
Pruning time March
Soil moisture Moist soil
Disease resistance Very good
Overwinter Can be left in the ground

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