Native to Southeastern United States, Muscadine grapes are well adapted to the hot and humid temperatures where they thrive well, unlike most European and American grapes that wither or dry up. Although they are found in California and its surrounding areas, they do not thrive as well as other kinds of cultivates grapes. Trellising is an important part of growing muscadines. Each vine grows quite large and heavy, and requires support of some kind, irrespective of whether you are growing one or two vines in your backyard, or have acres of land specifically for commercial growth.
Select an open area for the trellis. Purchase good quality rot-resistant wooden posts for the trellis structure from your local hardware store. You will need an end and brace post, while the number of line posts will depend on the number of vines. Ideally, you will need one line post per muscadine grape vine.
Dig a 3-foot deep hole with a post-hole digger or a shovel and collect the dirt in a wheelbarrow to discard appropriately. Place the 8-foot tall, 4-inch wide end post into the hole vertically. Have someone help carry the post to prevent straining your back.
Measure a distance of 6-feet on the ground from the end post and mark it with powdered chalk. Dig another 3-foot deep hole over the marked spot and stand another identical post in it. This is known as the brace post.
Take another post with the same diameter as the end and brace post but longer, and lay it over the tops of both. Position it carefully so it is just between both the tops, with at least a foot extending from both sides.
Use a measuring tape to measure 20-feet from the brace post, and mark the spot with powdered chalk. Use a post-hole digger to dig a 3-foot deep hole over the mark, and stand an 8-foot long post with a 3-inch diameter into it. This post is known as the line post, and you will need one per grapevine. Make sure the top of the line post is at the same level as the end and brace post. Continue spacing line posts 2o feet apart from one another.
Wind a 9-gauge galvanized steel wire around the top of the inside corner of the brace post and extend it diagonally down to the base of the end post. Cut the excess off with wire cutters, and twist the corners around tightly with pliers so it is secure.
Place a length of 9-gauge galvanized steel wire over the top of the last line post and staple it into place with 2 ½-inch staples. Do not make the staples too tight as the wire may break. Extend the wire to the top of another line post and staple it into place. Continue this procedure until the end post, where you wind it around the top and staple it so it is held firmly.