Trellising your vegetables has many advantages. Many vegetable plants benefit from support so heavy fruits don't weigh the plant down. Keeping fruits and leaves off the ground helps reduce the risk of diseases, mold, rot, fungus and insect damage. Harvesting is easier when vegetables are trellised as well. You won't have to root around in the mulch hunting under foliage for your fruits. Trellises are easy and inexpensive to build, so they are worth the effort.
Take two pieces of wood to make support posts for each planting row. If your planting rows are longer than 10 feet, use additional support posts.
Cut wood so that it is at least 2 feet taller than the height you expect your tallest plant to grow. The height of each support post will depend upon the height that you expect your vegetable plants to reach.
Place your support posts on each side of your planting row. Stake them approximately 18 to 24 inches into the ground. Tamp the dirt around them firmly with a shovel to secure them.
Take another piece of wood that is the length of your planting row. Screw it to the front sides of the support posts--the side where you'll be planting your vegetables. Screw it in about an inch from the top of each support post to create a frame.
Purchase some type of mesh for the frame. This can be a piece of grid fencing, gardening mesh or any type of wire mesh you find at the hardware store.
Measure your mesh to fit your frame. Use a staple gun to attach your mesh to your frame, stapling at intervals across the top beam and down the support posts.
Plant your seedlings or sow your seeds approximately 4 to 6 inches in front of the mesh. As plants grow, lift and arrange the branches or vines onto the mesh to train them on the trellis.