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A new clematis from Raymond Evison this year and my first clematis - could not be more happy with this plant if I tried! I planted it in June and after a brief acclimatization period it has been putting on fantastic new growth and flowering since. It is still flowering, actually, which makes it the only clematis I've seen in weeks still in bloom, and is even more amazing when you consider that we have had frost (it may be slightly sheltered from the worst of it but still!).
Definitely recommending Clematis 'Rebecca' if you're looking for a clematis.