Posted: 24/08/2013 at 14:40
Thanks everyone for your suggestions. Just to clarify, the first two photos are of a large flowered clematis, which has been growing in the same pot for about 5 years (tho' I have regularly removed some of the old compost and added new). It is now growing up the trellis on my new pergola ( which was erected 10 months ago).
The 3rd photo is of a viticella bought from Taylor's in May, which I have planted in JI compost in a pot which is standing against the opposite side of the pergola. I have put slow release fertilizer into the pot.
So neither is in the ground. As the big one flowered so well in June to begin with, I can't think that the new trellis is to blame.
LL - I could send a photo to Taylor's - good suggestion.
So, have any of you any clues as to the name of the large flowered one? It's a deeper purple than the photo shows.