Growing Method: All seeds are included in the pack Growth: Grows upwards over 9-12 feet Flowering season: Spring to Autumn Color: Mixed Color Note: Clematis seeds take a long time to germinate. Extends 6 months to 1 year Clematis are long-lived, climbing vines that can add color and texture to flower gardens. They are perennials that can regrow each year in most of the United States.