I picked up a spool of 14 gauge house wiring at Home Depot and use it to tie my climbers to the chain length fence. I first cut off a couple feet of the wire and attached it to the center of the spool. That gave me a handle for caring it around and allowed the spool to spin when I need extra wire. I also use one of those 3 feet long grippers (the type used to reach a box of cereal up high in the pantry). Using it I can feed the wire up over/around the canes then poke the gripper through to grab and pull the wire to me. A couple of twists to lock it in place followed by a snip with the cutters and I'm done. Twisting has to be done correctly or one of the ends can slip out. That is, both ends of the wire have to twist, not just one end around the other. It takes years before the wire needs replacing. Should canes die off and the wire is not needed in that spot I just use the wire somewhere else. Being black you have to really look close to even see the wire. As they said above the canes can be quite heavy. Some of my canes are up against our deck, 12 feet high, and need tying in more than one place due to the weight. Of course this is coming from a person who knows nothing about raising roses so buyer bewareâ¦. lol

Tapcon screws - they're blue, HD or Lowes. Place screws around a foot apart and tie the bougainvillea to it with clear fishing line. If you're really OCD, you can paint the screws after installation with some acrylic paint to match the concrete.

Rope won't last very long inside a high tunnel unless it is UV protected. An alternate to rope is wire but if you want to do a better job support the roller hooks from perlins with a "S"-hook, one for each roller hook. "S" hooks come in any length you want from 6" to 36", are super sturdy and since they are directly attached to the perlin when you won't have many of of your roller hooks fly off a wire when you "twang" the wire...and it will happen. I have not used the roller hooks but use the tomahooks. When I built my first high tunnel (20x96) I didn't think the frame would support the tomato weight and being impressed with high tensile fencing I burried telephone poles, braced and twitched, at each end of the high tunnel and strung 9 guage, 1800 lb, tensile strength wire through the high tunnel using a single open chain link and metal strap attached to arches to just hold the wire up. It works but I would never do that again. When I take one tomahook off the wire 5 others spring off as well For my followup High tunnel (30x96) I have 8 perlins that the "S" hooks are always hanging from. I slide them along the perlin to position them when starting plants on stringline. Center perlins have longer "S" hooks, two tomato rows per perlin; side perlins have shorter ones. You still want your roller hooks at least 7-8 ft. high IMO to allow plants room to grow while keeping ripening fruit between knee and shoulder height. Your roller hooks will be easier to lower plants than my tomahooks but the price for 800 roller hooks puts them out of my price range. I got all of my tomahooks at auction for practically peanuts b/c nobody knew what they were. So if you still want to tension the wire go to a Tractor Supply store or order the "In-line strainers" online from a high tensile fence supply outlet. Some strainers are meant to be tensioned with a special tool, others are tightened with a 1/2" rachet wrench. They are usually $2-$3 each and will last as long as your galvanized structure. Oh, the "S" hooks are available from greenhouse supply centers (ref. Nolts Supply, Leola, PA) and they cost ~$12- $37.50 (36") for bundles of 100.

It would help if you tell what zone you are. You can also ask your question on the Clematis forum Many clematis grow in less than ideal conditions. They will flower less, that's all. And they need to be taken care of first few years, with adequate watering and a couple of shovelfuls of good compost. I grew Clematis Tangutica and Paul Fargas in these conditions. Fargas is a massive monster. They both can grow up to 10' X10' in one growing season. That's one heavy vine, mine grows on a wooden structure. I had a SAC but it is borderline hardy in my zone, so it didn't survive, but it managed to grow & flower the first year. Another option can be planting shrubs, especially evergreens, if you are into them....