Clematis x jackmanii

PSC 2620: Woody Trees and Shrub Course Home Week 4

Clematis x jackmanii - Jackman's Clematis

Plant Viewer


The leaf of the Clematis is oppositely pinnately compound. The leaflets are 2-4 inches long.	The stem is reddish-brown and has parallel ridges running the length of the stem.

The large single flowers are very showy and bloom throughout the summer. They have 4-6 petals, but other cultivars of Clematis have more petals on each flower.	Seeds appear after the flower. They are light and airy and resemble a sea anemone.

Plant Description

Clematis x jackmanii is one of the most loved flowering vines in America today. It is famous for its large, bright and profuse flowers that put on a showy display throughout the summer. Although it can be a bit finicky to grow, it performs extremely well in the right conditions. While the plant needs good sun exposure, it is important to keep the roots and base of the stems protected from extreme heat (such as occurs against a western or southern-facing wall) or the vine will wilt and die back. It is best to shade the roots and stem base with plantings or mulch. It prefers equally moist soil conditions for best growth and flower production.

Clematis is a herbacious-woody plant, with the majority of the vine being herbaceous in nature. The stems are reddish-brown or grey brown in color. Older stems have parallel ridges running the length of the stem. The leaves are are bright green, oppositely pinnately compound, with 2-4 inch leaflets. The leaflets are typically ovate, but can vary quite a bit in form, with very noticeable venation pattern. The bottoms of the leaves are slightly pubescent.

The flowers are large (4-7 inches in diameter), 4 to 6 petals. There are an endless number of colorations available. The flowers bloom from early summer and will continue to bloom through until the first frost in fall. Once the flowers are done blooming, seed heads that look like sea anemones appear on the plant.

Landscape Use

Use as a climbing vine for its flower production. It needs a trellis or other climbing aid, but will readily twine around the structure without assistance. It is not suitable as a screen along a fence because it requires heavy pruning to encourage new growth and good flowering.

Points of Interest