This is a Viticella‑type clematis (though specific authoritative details sometimes vary between sources). Viticella types typically produce a reliable succession of flowers from mid summer into autumn on new season’s growth and fall into Pruning Group 3, so they benefit from a hard prune in late winter to stimulate fresh shoots that will carry blooms later in the year. The flowers are usually rich and saturated in colour (often deep purples or reds), and the plants are known for their late performance.