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    Pruning Clematis Viticella:
    1. Botanical Names: Clematis that bloom on current year's growth, such as Clematis viticella.
    2. Pruning Time: Late winter or early spring.
    3. Pruning Approach: Hard pruning. Cut back all stems to a pair of strong buds about 12-18 inches above ground level to encourage vigorous growth and abundant blooms.
      hortguide.com+1
    2 Sources
    Pruning Guide for Clematis — Chris Welch's Horticulture Field Guide
    Botanical Names: Clematis that bloom on current year's growth, such as Clematis viticella and Clematis 'Jackmanii.' Pruning Time: Late winter or early spring. Pruning Approach: Har…
    hortguide.com
    https://www.hortguide.com/posts/pruning-guide-for-clematis
    Clematis viticella | Italian Leatherflower Growing Guide
    Prune Clematis viticella in late winter or early spring, when new growth appears. Cut back to a set of strong buds about 1 to 2 feet (30 to 60 cm) above ground level.
    Gardeners HQ
    https://www.gardenershq.com/inthegarden/italian-leatherflower-clematis-viticella/
    hortguide.com
    gardenershq.com