In article 78b0f80a-7537-4306-943b-
,
says...
I have what is only described on the label as a "summer flowering
clematis", burgundy colour . First year it flowered, and I cut it back
in the autumn. Next year, masses of foliage, but no blooms, so I
didn't cut it back. This year, again, masses of foliage and now,
halfway through November, a few blooms at the very top of the plant.
Given the lack of information I have about it, I don't know what to do
for the best (or when to do it). Any advice welcome.

should be safe to cut bach hardish during winter, there are several
hybrids like 'Lady Betty Balfour' which in a cool summer will not flower
before November but they all flower on new wood so hard pruning before
growth restarts will not effect the flowering time. (they are all rubbish
here!!)
--
Charlie Pridham, Gardening in Cornwall
www.roselandhouse.co.uk
Holders of national collections of Clematis viticella cultivars and
Lapageria rosea