Select the appropriate gauge wire mesh for your needs. Jill MacKenzie, former Extension Specialist from the University of Minnesota, recommends using concrete- or cement-reinforced mesh with 4-inch holes for tomatoes. Not only does this mesh provide adequate support, the squares allow room for harvesting through the mesh. Choose a lighter-gauge mesh for smaller plants, such as peas or beans, or medium weight for crops such as cucumbers.
Choose wire mesh in a width that matches the desired height of the cage. For tomatoes, a width of 4 to 5 feet may be needed. Smaller plants, such as bush peas, may do fine with a 2- to 3-foot cage.
Cut the wire mesh to a length of 5 feet to make a cage with a diameter of 18 inches. Eighteen inches provides room for tomatoes to grow, but you may desire another size. Vary the length to fit your individual needs.
Cut the wire mesh with a pair of heavy-duty wire cutters. Cement-reinforced wire mesh may require a bolt cutter.
Roll the wire mesh into a cylinder. Wire the cylinder together by inserting the loose ends (where you cut the wires) through the mesh of the uncut end. Twist the wires with a pair of pliers to secure the cylinder. When using concrete-reinforced wire mesh, wire the cage together with separate wire.
Remove the bottom row of the 4-inch openings by cutting away the horizontal wires. This creates vertical spikes for anchoring the cage into the soil.
Center the cage over the plants and push the "spikes" into the soil to anchor the cage.