Answer: Clematis Ernest Markham is one of the strongest growers and produces bright magenta-red 5-6" flowers from July to September. The mature height 8-12'. Your clematis flowers on new wood so you'll want to wait until late winter and then prune it back hard, leaving only 4-6 buds on each stem. New vines will grow from these buds the following spring. Enjoy your clematis!
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