Start with sturdy stakes at least 6 to 8 feet tall. If you have a bamboo nursery nearby, choose strong, straight poles about 1 to 1 1/2 inches in diameter with thick cell walls.
Center a stake between each plant and drive it 12 inches into the ground using a sledgehammer or T-post driver. If you put a stake between every two to three plants, drive it 18 inches into the ground.
Use a durable, weather-resistant twine that doesn’t stretch too much, like tomato twine (a heavy-duty poly works well), waxed twine, tarred twine, or synthetic baler twine.
Starting about 8 inches above the ground, tie one end of the twine on the stake. Loop the twine across the back of the tomato plant, bring it around the front of the second plant, then behind the third plant.
When you reach the last stake, loop the twine around the stake in a figure-8, making sure the twine grips the stake and the line is taut, but not pulling too tightly to damage your tomato stems. Continue weaving the twine in and out between each plant on the other side, back to the first stake, and tie it off with a few knots.