I think its a bad idea to have a morning glory anywhere near a clematis. It will smother the clematis.

Hmmm, now I'll have to find a new place to put the Morning Glory.

Its spring clean up. Imagine yourself trying to figure out which of the dried stems, leafless, tangled together, is the Clem you need to save, and which is the dead morning glory that has to be cut down. Even if you can tell, its all tangled up in one unholy mess.

No, don't plant morning glories near Clematis.

why can't they be planted on each side, i was going to do the same. morning glory on one side and clematis on the other. what could happen,

I am not sure if the aesthetics would work but I see no problem doing that. I had a volunteer morning glory come up in a 15 gallon pot containing an established type 2 clematis. I let be so it would bloom when the clematis doesn't. It worked out fine. In fact the morning glory had a hard time competing with clematis and was not about as vigorous and aggressive as one would have expected. End of the season, it was easy to pull of the morning glory. Failing everything, just cut off the MG at the base.

Morning glories like to climb up vertically so I am guessing a fence is only attractive to them until they reach the top.