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Clematis Montana
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For more on marking an answer as the "Best Answer", please visit our FAQ.Has it become pot bound ? It might benifit from being given a good feed almost every time you water it with a quater strength liquid food such as miracle grow.
Then, next spring (march time), take it out of the pot, tease away all the old soil and cut away about 1/4 of the roots and repot in the same container.
You'll be amaized how starved things get in tubs especially quick growing plants such as clematis montana and wisteria
Thanks for your answer hammerman. It's definitely not pot bound and I have fed it. It was put into a huge container and I fully intended transplanting it into the garden soil as soon as it got going, but it has taken on a completely different form. Loads of new shoots every year, really abundant healthy looking leaves but nothing grows above 9" tall!!
I have a huge garden with several types of clematis and my other montanas are rampant. This one never had any flowers when in was first positioned and never did very well (although it did climb). I hesitate to part with it as it was a birthday present from an old friend who has since passed away. I think it was called 'Clematis Montana Alexander', but have lost the label.
I will do as you say and give it extra feed this year, but am still puzzled.
Best wishes.