Clematis Rosemoor™ performs with deep reddish-purple blooms on both last year and current season’s growth, extending the blooms from May to September. Flowers are 5-6″ across and center stamens are a contrasting yellow. Only needs to have its roots shaded and its flowers in the sun. Pruning Type 3 – This group blooms later and from new growth. These should be pruned in February or March as new leaf buds begin to show low on the plant.