Clematis, Jackmanii

Description
Long unbeatable for its extravagant blooming and intense purple flowers, this is the first large-flowered modern hybrid clematis. Plants flower on the current years growth and are best pruned in early spring before plants leaf out. One of the best vines, Jackmanii will be a dependable climber of fences, posts and trellises. Very hardy.

How to Grow
Keep weeds under control during the growing season. Weeds compete with plants for water, space and nutrients, so control them by either cultivating often or use a mulch to prevent their germination. 
Mulches also help retain soil moisture and maintain even soil temperatures. For perennials, an organic mulch of aged bark or shredded leaves lends a natural look to the bed and will improve the soil as it breaks down in time.  Always keep mulches off a plant’s stems to prevent possible rot.
Careful watering is essential in getting perennials off to a good start. Water thoroughly at least once a week to help new roots grow down deeply. Soil should be damp at about 1 inch below the soil surface. You can check this by sticking your finger in the soil. Water early in the morning to give all leaves enough time to dry.  One inch of rain or watering per week is recommended for most perennial plants. You can check to see if you need to add water by using a rain gauge.
Until plants become established, some protection from extreme winds and direct, hot sunlight may be necessary.  Good air movement is also important.
After new growth appears, a light fertilizer may be applied. Keep granular fertilizers away from the plant crown and foliage to avoid burn injury. Use low rates of a slow release fertilizer, as higher rates may encourage root rots.
You can always check to see which class your variety belongs to for pruning instructions. In general, vigorous species and early-flowering hybrids do not require pruning, just remove tangled growth. Large-flowered hybrids blooming in early summer on the previous season’s growth can be pruned lightly in the dormant season for structure. Late-flowering hybrids which bloom on current season’s growth can be pruned back to a pair of buds in the dormant season.
Do not divide clematis. If you would like to propagate plants, you can take cuttings in early summer. Choose half-wood cuttings, just before they turn to brown wood. Use a rooting hormone, keep them in high humidity and out of direct light. They may take 1-2 months to grow roots.

Tips
The seed pods of clematis are very attractive and may be used in flower arranging. The flowers are great for cutting.
Many varieties are vigorous vines and should be trained to climb a trellis, fence, arbor, wall, porch or lamppost.
They are also very effective planted to sprawl over and through large shrubs.
Clematis can be used for height and a good architectural framework for small gardens.