I have had fairly extensive experience germinating perennials, shrubs and trees from seed but have had limited experience with clematisâ¦ Blooming from midwinter onward, these very early flowering Clematis â¦ Seeds â¦ This seed â¦ You can start new plants from either collected seeds from an existing vine or from nursery-purchased seeds. Shop evergreen clematis (l4690) in the vines section of Lowes.com Evergreen Clematis Plants found in: Clematis urophylla 'Winter Beauty', Clematis 'New Love', Clematis napaulensis, Clematis 'Miss Bateman', Clematis x.. One of the easiest-to-grow of all clematis, these flowers open in early spring in colours ranging from pinks to red, and all have the most delicious perfume reminiscent of sweet marshmallows. The British Clematis Society (BCS) suggests essentially the same procure as ICS. Seed propagation takes the longest amount of time. Depending on the variety, the clematis will live for 25 years or more and may produce up to 100 blooms over the growing season. They put the pots in a âcold greenhouseâ without defining what that means. The earliest Clematis to flower, the Evergreen group includes small-flowering clematis which provide gardeners with some of the greatest pleasures in winter. It is not clear if they feel stratification is required.