Posted: 09/05/2014 at 14:08
The best advice I can give is to keep training/tying in the clematis round the obelisk rather than up. It requires a little effort but well worth it. There's so many varieties Scott - it's really a matter of your own preference for colour mostly. I'd agree with obelixx about one for each obelisk- (that's quite hard to say!)
I've just bought Niobe (dark purpley red) for this garden, which I love, and I'm considering it for an obelisk rather than a bed. Take a look at Taylor's Clematis online (other nurseries available too) which will show you some lovely choices - you can type in your preference - season of flowering, colour, aspect etc. Only trouble is, you'll want tons of them!