Green beans are an annual plant that grows in two varieties: bush and vine. Beans of the vining type, known as pole beans, need support to keep the growing beans out of the soil. Garden centers carry many types of poles and cages in which to grow beans, but a frugal gardener can make one herself with materials that may be already in her yard, or will cost a minimal amount at best.
Prepare the soil in your garden bed for the beans. A trellis is installed right before planting the beans, so any soil amendments must be made before adding the trellis.
Install a bamboo pole at the end of the garden row. The pole should be about in the middle of the width of the row, and hammered down into the soil so that it is about 1 foot deep. The rest of the pole should be sticking up about 6 feet from the ground.
Add other bamboo poles every 3 feet along the length of the garden row. End the row with another pole. The measurement between poles needn't be exact, but try to keep them an equal distance apart.
Secure netting to the first pole in the row with tacks. Insert tacks at the top of the net, the bottom of the net and every 4 inches or so all along the length of the pole. This will ensure that the net will not pull away from the pole.
Bring the netting toward the next pole in the row. Secure the netting with tacks in the same manner as in Step 4.
Stretch the netting from one pole to the other until you reach the end of the pole.
Plant your bean seeds in hills or rows directly below the netting. By the time the beans have begun to vine, they should be tall enough to reach the bottom of the net, and will begin to twine themselves in the netting.