Posted: 19/04/2015 at 11:24
Group 3 clematis flower on this season's new growth so do not prune now. Feed and water them well, train the stems to their supports as they grow and enjoy the show.
Next spring around late Feb or early to mid March depending on how cold the winter, cut them back to the lowest pair of buds on each stem and pull out all the top growth. Feed them well with clematis food and occasional tonics of liquid rose or tomato food and they'll do it all over again, producing more stems each year as they mature.
Here's a bit of my Etoile Violette grown under this pruning and feeding regime.