I plant mine 2 ft. apart so I would probably put 6 there. I would use wire for them to climb on. I like to use something with a larger grid like the rebar panels available from Lowes or Home Depot. It makes it much easier to pull the vines off when I prune them. It does rust so you might not want it there but consider the size of the mesh when you make a choice.

Thanks. Having never had a Clematis, I probably would have bought 2.

Here are three that I have growing on a fence. They are planted 2 ft. apart.

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Should have mentioned they are type 2 plants. They are Niobe, The President and Marie Boisselot (or maybe the white one is Madame Le Coultre).

Nice photo. I think I'll look for a grid like yours.

You can find wire grid fence panels like that at feed and farm stores. They are inexpensive. Clematis climb them better than wood lattice.

Type III pruning means whack them off short every year.

If you plant type I or type II prune plants, you will be looking at dried vines in the winter since the flower buds form the previous season. As BorS stated, if you get type III prune plants, you should cut them down when winter has firmly arrived (since the flower buds form on new growth) so if you do not want to look at the dead vines all winter this is the type you should get.

If you don't live where there are farm and feed stores, there are wire grid panels sold for concrete reinforcement at big box home improvement stores, but there is less choice of size of mesh and panel.