Alphabetical Plant Listing

Clematis 'Jackmanii' (Late Large-Flowered Clematis)

Jackman's Clematis, Large-Flowered Clematis, Clematis x Jackmanii


Among the most popular and easy to grow, Clematis 'Jackmanii' is a lovely deciduous vine which gets covered with a profusion of velvety dark purple flowers, fading to violet over time and harmoniously contrasting with the greenish-cream anthers. The 4-petaled blossoms are held wide open and measure 3-4 in. across (7-10 cm). A gardener's favorite since its introduction in 1862!

  • Blooming from early to late summer, this vigorous and extremely floriferous Clematis vine won the prestigious Award of Garden Merit of the Royal Horticultural Society for its noteworthy qualities.
  • It thrives in moist, well-drained soils, in full sun or part shade. Ideally, Clematis prefer having their 'heads in the sun and their feet in the shade'. Keep the roots cool and shaded by other plants or add a layer of pebbles or flat stones at the base. Afternoon shade is appreciated in hot summer areas.
  • Hardy to zones 4-11, it is incredibly free-flowering and can quickly grow up to 8-12 ft. long (240-360 cm).
  • Excellent choice for trellis, it can be trained to climb a wall, fence or arbor and is also well suited to containers. Combines beautifully with other climbers such as Roses. It will pair magnificently with Rose 'New Dawn'.
  • This Clematis belongs to the third group of Clematis - a group including Clematis which flower in late summer on growth made in that season. They should be pruned in late winter or early spring and require 'hard pruning': simply cut back the stems to a pair of strong buds about 1ft. (30 cm) above ground level before growth begins in early spring.

As climbers, Clematis are unsurpassed in their long flowering presence, their rich diversity of flower shapes, their wide array of colors and tolerances in terms of exposure and climate. It is no wonder they are so popular! From tree huggers to container varieties, there is a Clematis for every garden and flowers for almost every month of the year! Members of the Ranunculaceae family, they include more than 300 species and hundreds of hybrids. They create year after year a ravishing colorful show in the garden whether solely trained on walls, arbors or trellises, or grown in association with other climbers. They are divided into 3 groups which determine how they should be pruned. Regular pruning of Clematis is important as it promotes strong growth and flowering as well as a harmonious plant. If left unpruned, Clematis can turn into a mass of tangled stems with a bare base and flowers well above eye level.

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Requirements

Hardiness 4 – 11
Heat Zones 1 – 9
Climate Zones 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, A2, A3
Plant Type Climbers
Plant Family Clematis
Exposure Full Sun, Partial Sun
Season of Interest Summer (Early,Mid,Late)
Height 8' – 12' (240cm – 3.6m)
Spread 4' – 6' (120cm – 180cm)
Spacing 48" – 72" (120cm – 180cm)
Water Needs Average
Maintenance Low
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained
Characteristics Plant of Merit, Showy
Tolerance Deer
Garden Uses Arbors, Pergolas, Trellises, Beds and Borders, Patio and Containers, Wall-Side Borders, Walls and Fences
Garden Styles City and Courtyard, Informal and Cottage, Traditional Garden

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Great Plant Combination Ideas with Clematis

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* Top picture is courtesy of Botanik Foto

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 4 – 11
Heat Zones 1 – 9
Climate Zones 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, A2, A3
Plant Type Climbers
Plant Family Clematis
Exposure Full Sun, Partial Sun
Season of Interest Summer (Early,Mid,Late)
Height 8' – 12' (240cm – 3.6m)
Spread 4' – 6' (120cm – 180cm)
Spacing 48" – 72" (120cm – 180cm)
Water Needs Average
Maintenance Low
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained
Characteristics Plant of Merit, Showy
Tolerance Deer
Garden Uses Arbors, Pergolas, Trellises, Beds and Borders, Patio and Containers, Wall-Side Borders, Walls and Fences
Garden Styles City and Courtyard, Informal and Cottage, Traditional Garden

Great Plant Combination Ideas with Clematis

Guides with Clematis

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