Clematis ‘Multi Blue’ – An interesting double clematis with deep blue to purple flowers and a huge central stamen boss. The 4 to 5″ wide blooms appear late spring into early summer, and again from late summer through to fall. This cultivar seems to perform a little better in part sun and it grows an average of 6-8′ tall. Pruning group is B1 and hardiness is zone 4.
Clematis ‘Rouge Cardinal’ (syn. ‘Red Cardinal’) – Reds are surprisingly difficult to find in a clematis bloom and yet the glowing crimson of ‘Rouge Cardinal’ never fails to impress – the velvety flowers (4-6″ wide) are also accented by golden-brown stamens. This 1968 introduction grows 8 to 10′ tall and it falls under the C pruning group. Zone 3 hardy.
Clematis ‘Blue Light’ (syn. ‘Vanso’) – A fairly recent introduction with pale blue to violet-blue double blooms (4 to 6″ wide) from June to early September. This sport of ‘Mrs Cholmondely’ only reaches about 6′ to 8′ tall, making it a great choice for growing in a container. ‘Blue Light’ falls under the B2 pruning group and it is zone 4 hardy.
Clematis ‘Ville de Lyon’ – Introduced back in 1899, ‘Ville de Lyon’ remains a top seller, much in part to its floriferous nature (blooms continually from June to September) and the unusual flower colour. The edge of the petals is deep carmine, fading towards the center and nicely contrasted by showy yellow stamens. This cultivar grows 10-12′ tall and is a B2 or C group. Zone 3 hardy.
Clematis ‘Jackmanii’ (syn. x jackmanii) – While it may be one of the most common clematis out there, it is also one of the most durable and easy to grow. The deep purple blossoms of this old variety (introduced 1862) are between 4-6″ wide, and they are borne from June to August. ‘Jackmanii’ is a C group for pruning and grows 8-10′ (taller if not pruned). Zone 3 hardy.