I want to do a forty foot single wire trellis, planting a Carlos on one end and a Tara on the other. Will this work and what should I do when they meet in the middle? This is my first experience in planting scuppernong/muscadines. Am I headed in the right direction?
A single muscadine vine can produce 50 lbs of grapes. With two vines,
you could have 100 lbs of grapes on the trellis. It should be able to
bear the load. You could construct an H-brace on each end. This article on fence bracing from University of Wisconsin Extension shows how it's done.
But that may be more than is necessary for 2 vines. I suggest you
install 3 steel fence posts 20' apart. That would give you a 40' row. String MAX-TEN 200 High-Tensile Trellis Wire between the posts.
The wire should be 4' from the ground. Tighten the wire with a Hayes-style wire tightener. Install a duck-bill anchor at each end and attach to the end fence
posts. That should give you enough support. You can buy Hi-Ten wire, tighteners and duck-bill anchors from Kencove.com if you can't find them locally.
Plant your vines 10' from each end. Train your vines up to the single
wire trellis. Snip the growing tip (terminal bud) from the top of each
vine. Select 2 arms per vine and train them to the wire growing in opposite directions.
Each arm should grow 10' long. When the Carlos and Tara arms meet, snip
out the growing tips at the ends of the arms. Don't allow the Carlos and
Tara arms to grow over each other.
You are on the right track.