Nothing beats growing your own new clematis from seed, I have registered several new varieties, the latest being a new pink herbaceous called Carol Klein, with Carol's approval I hasten to add, not yet available to purchase.
To genuine enthusiasts I have plenty of spare seed, free, and will show you how to germinate them rapidly,
E-mail me if genuinely interested, see website www.hawthornes-nursery.co.uk
Details of the new Carol Klein can be found on Clematis on the Web A to Z
There speaks a true clematis enthusiast! It certainly is fascinating to think of finding new clematis, though I suppose good new ones are fairly rare. I'll be logging onto your website!