Superba Jackman Clematis

Clematis x jackmanii ‘Superba’

Description & Overview

Superba Jackman Clematis is one of the most popular of the clematis vines. It boasts showy, deep violet-purple flowers that are slightly broader than those of C. ‘Jackmanii’ and will cover this climbing vine throughout most of the summer. It’s an excellent vine for adding vertical interest to the landscape on a fence or trellis, or along rock walls.

Core Characteristics

Mature Height: 10-12 feet
Mature Spread: Varies
Growth Rate: Fast
Growth Form: Vine
Light Requirements: Full Sun to Partial Shade
Site Requirements: Moist, Well-drained
Flower: Dark purple
Bloom Period: Summer through Fall
Foliage: Green
Fall Color: N/A
Fruit Notes: feathery clusters

Suggested Uses:

  • Border (through medium sized shrubs to act as groundcover),
  • Container gardens (again, to act as groundcover or keep the vine contained),
  • Cut flower garden (flowers are beautiful and make nice additions to any bouquet),
  • Espalier (there is not much depth in the z-direction but it grows full in the x and y directions),
  • Ground cover (for areas where grass can be out of the question or some color is wanted); just don’t trellis it,
  • Privacy screen (adds beauty and density to a fence or trellis),
  • Specimen (showy flowers are enough to attract anyone’s attention and create a focal point in any garden),
  • Urban garden (similar reasoning as espalier, this vine does not take up as much space and can tolerate limited horizontal area as long as there is room for vertical growth),
  • Woodland garden (while not a native, some species of Clematis are and this variety will still make a nice addition or climb tree trunks if the garden is near the woods)

Wildlife Value:

Flowers are attractive to butterflies.

Maintenance Tips:

This Clematis thrives in well-drained, lightly alkaline soil, with roots sheltered and top growth in the sun. Bark mulch will help conserve moisture. Water deeply, regularly in first growing season to establish the root system. Fertilize regularly beginning in spring. Pruning time: late winter or early spring. Prune spent flowers to promote repeat bloom and to stimulate a large flush of new growth. Type 3/Group C pruning – flowers on new wood.


Clematis in general have no known serious issues.

Most plants can be prone to common, ornamental (non-lethal) issues caused by various environmental conditions. Clematis may be susceptible to wilt/stem rot (potentially fatal), powdery mildew, leaf spots, rust, and viruses. Potential insect pests include aphids, vine weevils, slugs, snails, scale, and earwigs. Watch for spider mites. Alleviate these common issues with over-the-counter insecticides or pesticides.

Leaf Lore:

Native to Europe, the Himalayas, China, Australasia, North America, and Central America, there are over 250 species in existence. Flowers symbolize mental beauty, art, and poverty in Europe. All parts of this plant are poisonous and can cause irritation to the skin and eyes. This cultivar has been a gardener’s favorite since its introduction in 1880! Flowers are followed by silky seed heads to provide winter interest.

Companion Plants:

Japanese Maple, Climbing Rose, Daylily, Hydrangea, Butterfly Bush.

  • Japanese Maple (foliage color often compliments flower color, most Clematis are native to Japan and this combination is often grown naturally together),
  • Climbing Rose (flower texture and colors add contrast to the Clematis flowers while maintaining a similar foliage, this is not a plant we sell),
  • Hydrangea (can help fill in the bottom when the vine matures upwards),
  • Butterfly Bush (an additional source of color and also attracts pollinators, while filling in the bottom when Clematis begins to mature upwards)

Butterfly Bush and Hydrangeas will also shade the ground/soil, helping to keep the roots cool. Clematis prefer a cooler root zone.

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