Answer: Nellie Moser is Clematis montana, also known as Anemone Clematis. It's a vigorous grower, extremely hardy, and produces masses of 2-2 1/2" anemone-like flowers in early spring, opening white then turning pink. Your clematis flowers on old wood and can be pruned immediately after flowering to rejuvenate the plant or to reduce its size. When you prune, leave some main branches. New flowering shoots will develop from old wood, providing next spring's display of flowers.
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