While nothing could be easier than simply tidying up the type 1 and 2 clematis, pruning type 3 clematis is considered by many to be the easiest. Prune Late-Blooming Clematis (Group 3) The late-flowering group produces flowers on the current season’s growth, which requires a different approach to pruning. If you see buds developing when pruning clematis vines, you may be pruning at the wrong time. If no pruning is done, clematis species and cultivars will continue to grow and flower -- but they may become unmanageable vines. Blooms of this clematis developed during last year’s growing season. Clematis Pruning Groups. Just be sure you leave two sets of healthy buds on each stem, about 12 to 30 inches above the ground. Pruning Group 3 (PG3): Clematis which flower on the current year's new growth after early summer. These vines start their new growth close to where last year’s growth ended. Do annual pruning in late winter or early spring, cutting back all the old stems to the lowest pair of live buds. These plants typically die back to ground level in the winter, and any old plant material left in place creates a disheveled mess. Flowers that bloom in spring grow on old wood. As the popularity of Clematis increases, gardeners want more information, so they can be successful with this 'Queen of the Vines'. Pruning Type 3 Clematis Flowers. Plants in this clematis pruning group should be pruned before the end of July to allow blooms for next year. Type 3 clematis produce flowers in late spring and summer on the current year’s growth. Group 3 clematis are the easiest to prune, because although you cut away more of the plant, there is little decision-making necessary. Two sets of healthy buds on each stem, about 12 to 30 inches above the ground with... Of the plant, there is little decision-making necessary buds on each stem, about to! 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