Jackmanii’ has 5-6″ spectacular, dark, violet-purple, semi-nodding flowers with green stamens that are borne in great profusion from July to October. It is popular and reliable. This vine grows best in a fertile, well-drained, alkaline soil. A choice site is key to the success of establishing this perennial; roots should be kept cool and moist.
The Clematis performs best when sufficient moisture is given and the base of the plant is kept cool. Plant in a sunny location but cover the root zone with mulch or stone. Prune the first spring after planting to 6-12″ from the ground.
Clematis is a genus of over 250 species, most of which are woody to semi-woody deciduous vines climbing by twining leaf stalks or in some cases trailing over support, but in a few cases grow as freestanding or sprawling herbaceous perennials and small deciduous or evergreen shrubs. Most have flat, cupped or bell-shaped flowers. Some plants feature ornamental fluffy seed heads in autumn. Plants bear opposite, simple to compound leaves which are usually deciduous but sometimes evergreen. Compound leaves range from lobed to trifoliate to biternate to pinnate to bipinnate. Clematis is native to both the Northern and Southern Hemispheres including Europe, the Himalayas, China, Australia, North America, and Central America.