Choosing Zone 4 Clematis Vines Jackmanii is probably the most popular and reliable zone 4 clematis vine. Its deep purple flowers bloom first in spring and then again in late summer through fall, blooming on new wood. Sweet Autumn is another popular cold hardy clematis vine. It is covered in small white, extremely fragrant flowers in late summer through fall. Listed below are additional clematis varieties for zone 4. Chevalier – large, lavender-purple blooms Rebecca – bright red blooms Princess Diana – dark pink, tulip-shaped flowers Niobe – deep red flowers Nelly Moser – light pink flowers with dark pink-red stripes down each petal Josephine – double lilac-pink flowers Duchess of Albany – tulip-shaped, light-dark pink blooms Bee’s Jubilee – small pink and red flowers Andromeda – semi-double, white-pink flowers Ernest Markham – large, magenta-red blooms Avant Garde – burgundy flowers, with pink, double centers Innocent Blush – semi-double flowers with “blushes” of dark pink Fireworks – purple flower with dark purple-red stripes down each petal...