Not clothes pins, ever. Graham Thomas has canes that canker easily and keeping a year or two year old cane in close contact with a fence would be a place that water would accumulate next to where there was damage to the cane from wind moving it against the fence.

A gentle use of jute string loosely around the canes/stems and then a second knot holding it to the fence.

You are in a zone where winter won't kill the canes back?

Thanks so much. I'm in 7b. Brooklyn NY. How do I fasten a second knot holding it to the fence? Make a knot and shove it through the horizontal opening?

If you can't tie the canes to the fence, you could tie the climber to posts in front of the fence. You can paint the posts to make them blend in with the fence.

What I usually do is a loose knotted string around the cane, then take that string (longer than it needs to be) and wrap it around the post then a loose knot followed by at least four half hitches. Half hitches mean I can make it loose at any time. A half hitch is so easy, once you've done five, it will be yours forever.

You are brave. Lots of luck with tying GT canes horizontal !!. This is a stiff, upright rose plant. Start when the canes are young and tie them the way others have suggested. Untie and then re tie every two weeks as the grow along the fence. I hope you succeed.

That is adorable! I plant my GT this spring and it is tiny. I hope it will look like yours.