Pruning group 2. Some flower again in late summer on new growth. This means that you should prune it right after the first flowering. Group 2 clematis. Group 1 clematis. Climbing to a modest 4’, Nubia packs a punch with large 5-6” crimson star-shaped blossoms accented by purple anthers. Stems that bloom late should be hard pruned, about a foot from the ground. Group 1 clematis to grow. This Clematis belongs to the second group of Clematis - a group including Clematis which flower in early summer on short shoots developing from the last year's growth. It is best to prune it every other year. This Clematis belongs to the third group of Clematis - a group including Clematis which flower in late summer on growth made in that season. They should be pruned in late winter or early spring and require 'hard pruning': simply cut back the stems to a pair of strong buds about 1ft. How to grow Group 1 clematis. Stems that bloom early should be dead-headed after the flowers fade, but not cut back, as they will produce buds for the following season. Prolifically flowering, the sumptuous show goes on from late spring through summer, repeating in autumn. These early-flowering clematis burst into bloom in winter and spring on the previous year’s growth. The ASPCA lists clematis as being toxic to dogs and cats. Pruning this group takes a bit of finesse but can be done if you pay attention to blooming times throughout the season. Pruning Clematis 'The President,' Its Relations With Animal Life . There are three categories of clematis – group 1, 2 or 3 – which require pruning at different times. (30 cm) above ground level before growth begins in early spring. It is also poisonous for humans, according to North Carolina State University. These Clematis vines should be pruned in late winter or early spring before new growth starts and after the first flush of flowers in early summer. 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