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Clematis jackmanii - Clematis vine

Clematis jackmanii
Jackman's clematis

4,5/5
36 reviews
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Very vigorous plant, planted and already making its way up its support!

Isabelle, 07/03/2024

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This plant carries a 6 months recovery warranty

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This clematis needs no introduction. Throughout summer, it displays spectacular star-shaped flowers in a rich purple-crimson colour. These flowers are centred around a small bunch of cream-white stamens. They bloom on a climbing plant with a bushy, dense, and compact habit, adorned with deciduous foliage that is ternate, ranging from medium green to dark green. This very old variety is fully hardy, floriferous, and undemanding, which makes it suitable for all our regions.
Flower size
15 cm
Height at maturity
3 m
Spread at maturity
1 m
Exposure
Sun, Partial shade
Hardiness
Hardy down to -29°C
Soil moisture
Moist soil
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Best planting time March, October
Recommended planting time March to May, September to October
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Flowering time June to September
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Description

Clematis 'Jackmanii' has won the hearts of gardeners around the world with its astonishing ability to flower and grow almost anywhere. It displays an abundance of spectacular star-shaped flowers in a rich purple colour, centred around a small bouquet of white-cream stamens. This climbing plant is bushy, dense and compact, adorned with deciduous foliage, ranging from medium green to dark green. This legendary clematis is fully hardy and undemanding, making it suitable for all regions.

 

Clematis belong to the Ranunculaceae family. They are found in both hemispheres, especially in Europe, the Himalayas, China, Australia, and North and Central America. The 'Jackmanii' variety was first introduced in England in 1862. This horticultural hybrid is the result of a cross-breeding between C. lanuginosa, a Chinese plant with immense flowers, C. viticella 'Atrorubens', native to southern Europe with bell-shaped carmine flowers, and an old English hybrid of C. diversifolia dating back to 1835, with flowers consisting of 4 violet-purple sepals. It is easy to understand why Jackman's clematis, with its exceptional genetic heritage, combines so many qualities and demonstrates remarkable adaptability to different growing conditions.

It is a perennial semi-woody climbing plant that will reach a height of 3 to 4m (10 to 13ft), with a minimum spread of 1m (3ft). This clematis bears large star-shaped flowers, reaching up to 15cm (6in) in diameter, which appear in successive waves on the current year's shoots, from June to the end of summer. The flowers are solitary or grouped in clusters. They have 4 to 6 purple-violet petals that slightly overlap. The centre of the flower is adorned with a beautiful crown of cream stamens. The flowering is followed by decorative silvery-grey feathery fruits that persist until winter. The glabrous leaves are divided into 3 leaflets, ranging from bright green to dark green. This clematis clings to the support or host plant through petioles transformed into tendrils.

 

Plant your clematis alongside climbing roses to extend the flowering period until the end of summer. It is a diverse genus, with flowers in all colours, shapes, and sizes. Take advantage of their easy cultivation to give your garden a romantic and bohemian touch.

 

Tips: avoid excessive use of fertilisers that stimulate foliage growth at the expense of flowers. Do not mulch in order to avoid excessive moisture that promotes wilting disease.

 

Clematis jackmanii - Clematis vine in pictures

Clematis jackmanii - Clematis vine (Flowering) Flowering
Clematis jackmanii - Clematis vine (Foliage) Foliage

Plant habit

Height at maturity 3 m
Spread at maturity 1 m
Growth rate fast

Flowering

Flower colour blue
Flowering time June to September
Inflorescence Cyme
Flower size 15 cm
Fruit colour grey

Foliage

Foliage persistence Deciduous
Foliage colour green

Botanical data

Genus

Clematis

Species

jackmanii

Family

Ranunculaceae

Other common names

Jackman's clematis

Origin

Cultivar or hybrid

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Planting and care

Plant Clematis 'Jackmanii' in a sunny or lightly shaded position. Plant it in fertile, humus-rich, well-drained soil, shading the roots and base of the stem (with a flat tile, for example). Clematis wilts in excessively moist soil. Work the soil to a depth of 20cm (8in), and lighten it with good compost and coarse sand. Position the plant and cover the root ball with 3cm (1in) of soil. After planting, cut back the clematis stems to about 30cm (12in) above a nice pair of buds. Water generously and regularly during the first few weeks. Do not let water stagnate as this can lead to the development of a fungus at the collar.

Mulch all clematis plants in February with garden compost or well-rotted manure, avoiding direct contact with the stems. Train the stems, without constricting them, until the plant can grip onto supports by itself. Clematis plants also like to grow freely on neighbouring plants.

After a few years, cover the base of your climbing clematis with a small mound of soil to reduce the risk of wilting while also promoting the growth of vigorous shoots from the stump.

Voles and grey worms can attack clematis plants and eat the stems. Aphids and greenhouse whiteflies are also potential parasites of clematis plants.

Planting period

Best planting time March, October
Recommended planting time March to May, September to October
Type of support Arbour, Pergola, Trellis, Wall

Intended location

Suitable for Meadow, Woodland edge
Type of use Border, Climbing
Hardiness Hardy down to -29°C (USDA zone 5) Show map
Ease of cultivation Amateur
Planting density 1 per m2
Exposure Sun, Partial shade
Soil pH Any
Soil moisture Moist soil, fertile, deep and well-drained

Care

Pruning instructions It blooms on the current year's branches. At the end of winter (usually in March), cut the stems back to 20cm (8in) from the ground. On an older plant, cut above a pair of buds.
Pruning Pruning recommended once a year
Pruning time March
Soil moisture Moist soil
Disease resistance Good
Overwinter Can be left in the ground
4,5/5

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