Grapes grow on weighty grapevines that are trellised for additional support. Depending on personal taste, a grape trellis is made from pre-treated lumber, metal, PVS pipes along with other weather resistant material. Build an inexpensive grapevine trellis with wooden boards that lift growing vines off the ground so they receive maximum sunlight and air. Trellising grapes also ensures a healthy, succulent crop, and reduces the time it takes to harvest mature grapes. Provide each grapevine an individual trellis, and space multiple vines 8 feet apart.
Measure and mark a 3-foot height on one end of the 9-foot tall lumber with a marker. Extend the mark all around the lumber with a ruler, so it is straight. Repeat the procedure with the second 9-foot length.
Dig a 3-foot deep and 8-inch wide hole over your desired spot with a post-hole digger or shovel. Collect the soil in a wheelbarrow for later use. Tamp the base of the hole down so it is level and even. Measure a distance of 10 feet from this hole in a straight line, and dig an identical hole over the spot.
Pour concrete into a large bucket, and follow label directions for adding the appropriate amount of water. Mix well with a stick or hand trowel.
Stand each length of lumber vertically into a hole, with the 3-foot portion underground and the marked line at the same level as the surrounding soil. Pour concrete into each hole until 2/3 of the way, and allow it to dry thoroughly overnight.
Check the concrete next morning to ensure it is dry, and add soil from the wheelbarrow the remaining 1/3 of the way into each hole. Tamp the soil down with your fingers to remove air pockets and ensure it is in line with the surrounding soil.
Place a 12-foot long 2-x-4 horizontally 6-inches below the tops of the vertical posts. Have a friend help hold the other end of the pole. Although both vertical poles are spaced 10 feet apart, the 1-foot overhang on each side of the 12-foot lumber allows for added security. Drill it in place with wood screws.
Place another horizontal 12-foot long 2-x-4 under the previously installed length, and drill it to each vertical pole with wood screws. Repeat the procedure with two more lengths, each spaced a foot apart.
Hold a 10-foot long lumber against the top of the first vertical post, and drill it in place. Extend it diagonally so its lower end rests against the lower edge of the other vertical post. Drill it in place with wood screws. Hold the second identical length of lumber against the top of the second vertical post and drill it in place. Extend it diagonally so it forms an X-shape, and secure its base against the lower edge of the first pole.