Clematis Evison 'Bourbon' has large, vibrant red flowers with pink stripes and yellow centres.

Clematis Evison ‘Cassis’ has stunning double flowers of cream dramatically overlaid with warm purple veins.

Clematis Evison ‘Cezanne’ is from the compact Boulevard series and grows to just 3-4 feet tall with lovely lavender-blue to mauve flowers.

Clematis Evison ‘Cezanne’ is from the compact Boulevard series and grows to just 3-4 feet tall with lovely lavender-blue to mauve flowers.

Clematis Evison 'Charmaine' has rich red, single to double flowers with yellow centres.

Clematis Evison 'Chevalier' has stunning violet-blue flowers with a reddish central band. The flowers can be single, semi-double or double.

Clematis Evison 'Clair de Lune' is a tall, repeat bloomer with large 5-8 inch single flowers of lavender and white flowers.

Clematis Evison 'Clair de Lune' is a tall, repeat bloomer with large 5-8 inch single flowers of lavender and white flowers.

Clematis Evison 'Corinne' has ruffled white flowers with subtle violet pink stripes and pink and white anthers.

Clematis Evison 'Corinne' has ruffled white flowers with subtle violet pink stripes and pink and white anthers.

Clematis ‘Crystal Fountain’ has lavender-blue petals with striped olive green centres, white stamens and a central yellow cluster.

Clematis ‘Crystal Fountain’ has lavender-blue petals with striped olive green centres, and white and yellow stamens.

Clematis Evison 'Darcy' produces smaller four inch wide flowers in great numbers from early summer through fall.

Clematis Evison 'Diamantina' has gorgeous, large, 4-6 inch wide, double pom-pom-like, purple-blue flowers.

Clematis Evison 'Diamantina' has gorgeous, large, 4-6 inch wide, double pom-pom-like, purple-blue flowers.

Clematis Evison 'Diana's Delight' has large, 4-6 inch wide, single, lavender flowers with yellow anthers on 6-8 foot vines.

Clematis Evison 'Diana's Delight' has large, 4-6 inch wide, single, lavender flowers with yellow anthers on 6-8 foot vines.

Clematis Evison Boulevard 'Edda' has large semi-double flowers of deep purple with red bars on 3-4 foot long vines.

Clematis Evison Boulevard 'Edda' has large semi-double flowers of deep purple with red bars on 3-4 foot long vines.

Clematis Evison ‘Elodi’ is extremely compact with stems to just 1-2 feet long and dusky pink flowers.

Clematis Evison 'Empress’ has pink petals with deep magenta midribs which frame a large pink and white boss of stamens centred with lime green.

Clematis Evison 'Filigree' is a dwarf clematis with single and semi-double, lightly ruffled lavender flowers.

Clematis Evison 'Fleuri' is a short, repeat bloomer with large 5 inch wide single flowers of violet-purple.

Clematis Evison 'Giselle' is a stunning cultivar with narrow, pointed petals in shades of light to mid pink.