Materials and Tools needed
- Large, heavy posts (at least 3” in diameter, made of wood and resistant to rotting)
- Lighter supports (made of light metal or wood)
- 10-12” high, tensile, stainless steel wire
- Anchors or cement
- Cordless drill
- Heavy-duty fence posts
The Two-wire System
There are a variety of ways to build a grape trellis. The most simple and basic way is the two-wire system which works well with cordon-trained vines. You have the cordons on wire that is less than 5 feet in height and have the second wire approximately 14 inches above the first wire.
You can see the efficiency of the two-wire system when the plants grow and the shoots eventually ravel around the wire for support.
Making the Posts
There are only two kinds of posts that you need for your vines;
- large, heavy posts that will hold up the wires and
- lighter, smaller posts that will support the vines.
In spacing the posts, you should consider the climate and weather changes in the area. If the area is visited often by strong winds, the heavy posts must be placed close together (about 15 to 20 ft. apart).
Heavy posts must be buried about 2 feet into the ground. Always add an additional 2 feet whenever you are measuring the length of your posts.
Making the Wire
The wire for a grape trellis usually consists of 10-12 gauges. The most recommended type of wire is the high, tensile stainless steel wire because it is rust-resistant and it can be stretched easily.
Anchors secured to the wires at the ends of the grape trellis will make the wires stay tight and taut. Anchors should be dug into the ground about 2-3 feet deep. They should have a loop or hook at the top for tying the wire.
Attach the wire to the posts by drill holes in them. You can use a cordless drill, or a large hammer and heavy duty nails if you don’t have one.