Clematis don't climb cedar lattice well. The lattice is usually to wide for them to wrap their leaf pettioles around. If you use lattice you will have to thread the vines through the lattice yourself. This isn't a problem with the pruning groups 1 or 2 as they are light pruning. After the first year or two the vines are established. With the type 3's that you hard prune every year(like your purple one) you will have to thread them through the lattice every year. I don't know if you want to do that.

I would mulch your clematis well and keep them well watered before winter, especially the ones under the eaves. If the ground freezes when the soil is dry you might lose them. I would wait until late winter or early spring to cut them back. If you have a severe winter or little snow cover the extra vines will give the plant protection.

If you want to know what type of clematis you have you can post pictures next year on this forum and we will try to ID them for you. Good luck with your clematis.

Thanks for the advice on the lattice - I think I might go for something that isn't as wide as traditional lattice instead - some other type of trellis or frame with thinner bars/dowels to allow the pettioles to latch onto...

I'm planning on moving the purple one to another location near the house - partially to hide a hideous hydoelectric meter and pole and to give some more interest to the back terrace. I've read on here that the fall is the best time to do that...

Agreed on the lattice. I did not know this and we used it for fences and trellises that DH built. They do not climb it well and earwigs seem to live in it too. :( No way I can have DH change it all to wire fencing.

I would prune them in spring not fall in your zone.

I know - Earwigs are a bit of a problem in my area...especially this year. I am thinking about getting these Maypoles from Lee Valley instead of the trellis or lattice...

Here is a link that might be useful: Maypole @ Lee Valley

I am so glad this conversation came up! I read the lattice doesn't work & well..have several clematis growing up the vinyl lattice without a problem. I couldn't understand what the issue was. Now this makes perfect sense, they are the type 2's. Because of this scenario, I decided to plant a bunch of type 3's up the same type of vinyl lattice! Luckily, I can easily add wire to this area so it won't be so problematic.

Thank you for the clarification!