You are growing SAC in a container? Can you describe the size of the container and how it is planted and what kind of care it gets?

FWIW, this is not a clematis I'd pick for growing in a container :-) Is there a reason you can't plant in the ground?

It is an old house and we had an arbor built but there is stamped concrete and no where to plant. It started off beautifully but then it went total opposite...should I plant in the ground and try some other climbing vine?