In article , lid
says...
wrote:
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.

I am afraid that this also seems to be my experience with the summer and
autumn flowering hybrids. No problems with alpina and montana, or the
evergreen types such as cirrhosa balearica, armandii, or uncinata. Yet I
see perfect specimens in other gardens, so it must be something I am doing
wrong!


The problem ones are all jackmanii types, stick to the viticella types
for trouble free clematis, some recommends
Etoile Violette
Kermesina
Emelia Plater
All flower between June and September
There are hundreds but these are a good start point
--
Charlie Pridham, Gardening in Cornwall
www.roselandhouse.co.uk
Holders of national collections of Clematis viticella cultivars and
Lapageria rosea