Late Large-flowered Group:
This group is made up of two sub-groups: first, the of cultivars from C.
lanuginosa; and second, cultivars from the Jackman Group which is essentially C. viticella and its cultivars (in the original cross the selection C. 'Atrorubens' was used) crossed with C.
lanuginosa. Crosses between C. viticella and C. patens are also included. The distinguishing characteristic of this group is that the vines produce their flowers on the current year's growth. Because of that fact, these plants may be hard pruned during the winter to promote new growth. These vines bloom in the summer, many extending their bloom into the autumn. The flowers are most commonly single and come in a rich variety of colors ranging from white, pink and red to blue and purple. The flowers are generally not as large as those of the Early Large-flowered Group and are rarely doubled.
This group is ideal for growing in shrubs because the vines can easily be cut back to allow shrubs a period of time to recover from their summer weight. For example, for many years we grew red-purple flowered Clematis 'Ernest Markham' in a white flowering Buddleia pruning both back at the same time in late winter. In addition, we grow many clematis in this group on trellises that serve as backdrops to our roses. The trellises offer support but also allow the flowers of the clematis to mingle with the roses. We like to keep the clematis leaves off of the roses to promote good air circulation and prevent disease. We grow Clematis 'Negritanka' on a trellis above an orange-toned rose. There the purple flowers of the clematis are a perfect complement. As another example, we grow Clematis 'Madame Édouard André' on a large trellis together with the dark leafed Vitis vinifera 'Purpurea' to give that vine a color boost during the summer before its green leaves turn purple.
Be sure to feed these plants during the spring and any time you cut them back during the growing season. We use a well-balanced organic fertilizer. Many home-growers recommend organic tomato feed.
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