Clematis that bloom in very late spring and early summer should be pruned before they blossom. Most clematis fall into Group Three, and should be prune in late-winter. This can help prevent clematis … I know it is recommended to prune it, like other Group 3 clematis, in late winter and/or just before they resume growth in the spring because they bloom on current season's growth. Alternatively, prune it in late winter or early spring before it begins to sprout new growth. Varieties in this group include the large-flowered Nelly Moser, Niobe, Bees Jubilee, Aneta and Princess Charlotte. But in normal garden conditions, pruning of Clematis is a 'must'. Wait to prune Jackmanii until after it finishes flowering in the fall or early winter. Group #3: Late large-flowering, late flowering species, and viticella clematises make up this group. Group two. 1. It is desirable to remove all the old … Small-flowered, late spring or early fall blooming clematis flower on new growth. Clematis are normally grouped into three distinct sections for pruning. If the clematis isn’t pruned while it is still young it can produce very long single stems and only flower at the very top. Prune the vines back to within 12 inches of the ground using pruning shears in winter, usually in February. After planting, cover the ground around the clematis with some stones or tiles. ... Don’t prune too … Pruning small-flowered clematis. Discard the cut vines. Group 1. it is best to plant all Clemetis about 4 or6 inch deeper than it was in the pot as they are prone to stem rot and no one knows why, but deeper planting means that if the stem does rot at ground level, the plant will throw up new shoots the following year. If it is not pruned, it will eventually overrun the other plants in the garden. Is there any good reason not to prune Clematis jackmanii now? This type of clematis include most large-flower types. These sort of clematis produce so many buds that they need to be cut back so that most of the flowers have a chance to bloom. If you are going to prune clematis, then it needs to be carried out correctly. Most of these plants are vigorous growers that will add up to 12 feet of new growth during a single growing season. All clematis thrive in fertile, moisture-retentive soil. Pruning clematis Gardening Guides from BBC Gardening. Flowers through late Spring and Summer and those which flower twice (once in early Spring and again late Summer). Clematis Pruning Group 2. If not, they respond well to hard pruning and can be cut back to about two feet tall. 2. The best time to prune is mid to late spring, immediately after flowering. However, as with many other shrubs, many clematis do not 'have' to be pruned. Dig a deep planting hole and add plenty of well-rotted organic matter. They generally die back to the ground in winter in cold areas.