Clematis 'Gypsy Queen' has stunning velvety plum purple flowers with pronounced raised mid ribs.

Clematis 'H.F. Young' is one of the most popular blue-flowering cultivars with mid blue tepals with lighter central bands.

Clematis 'Hagley Hybrid' offers delicate shell pink flowers with white and purple stamens. It is hardy to zone 3.

Clematis 'Halina Noll' has very large white flowers tinged with pink tips around dark stamens.

Clematis 'Hania' is a striking Polish cultivar with magenta-red, multi-tepaled flowers with lighter pink edges.

Clematis 'Henryi' is a historic cultivar that is more than 150 years old that produces masses of pure white flowers.

Clematis 'Horn of Plenty' has huge flowers 8-10 inches wide in shades of rosy purple with reddish purple veins.

Clematis 'Joan Picton' is a free flowering variety with glowing lilac-purple blooms with broad light lavender to white central bands.

Clematis 'John Warren' offers stunning large white flowers with central bands and edges of carmine pink around red stamens.

Clematis 'Julka' has large, bold purple flowers with a bright red bar on each tepal.

Clematis 'Kardinal Wyszynski' is a striking Polish cultivar with glowing carmine red flowers with darker central bands.

Clematis 'Kathleen Dunford' has blue jeans purple, semi-double flowers with stamens all the same length.

Clematis 'Kilian Donahue' opens fuchsia pink with a magenta-red bar and slowly fades to pinkish lavender with a darker pink bar.

Clematis 'Kimi'idera' has medium-large, star-shaped single flowers of lavender with white bars and red anthers.

Clematis 'Kiri Te Kanawa' has early 6-9" (12-15cm) flowers that are deep blue with cream stamens and slightly smaller and paler later.

Clematis 'Lincoln Star' offers beautiful, large, bicolour flowers with broad mid pink bars edged with lighter pink or white.

Clematis 'Lord Nevill' offers beautiful intense dark blue flowers with reddish purple bands along the frilly tepals.

Clematis 'Louise Rowe' offers lovely single and double flowers in softest mauve and pink.

Clematis 'Marie Louise Jensen' is a repeat bloomer with large double and single flowers in purple shades with contrasting anthers.

Clematis 'Miss Bateman' is an heirloom with gorgeous creamy white flowers with pale green central bands.

Clematis 'Mme Le Coultre' has been a classic for more than 100 years with its pure white flowers and yellow stamens.

Clematis 'Moonlight' produces creamy white flowers embossed with yellow stamens and a palest yellow midrib.

Clematis 'Mrs Cholmondeley' was first introduced in 1873. It has beautiful mauve-blue flowers.

Clematis 'Mrs N. Thompson' has striking deep violet-purple tepals with a bright red bar.

Clematis 'Mrs P.T. James' offers amazing sky blue double and single blooms.