Pole beans are a good choice for first-time gardeners as they grow almost anywhere. Pole beans are a vine plant and will take any available route to spread. If you build a trellis for pole beans, the vines will grow up, which saves space and helps improve the health of the beans and plants.
Cut off the corners on one end of two of the boards. This creates a pointed stake for the board to go into the ground and creates the legs for the trellis.
Measure from the top of the legs down 3 feet and mark a line. From the top of each board, measure down and mark every 10 inches; this is where the nails will be placed. Stop at the 3-foot mark for the legs.
Place the nails in the center of the boards at the marks. Drive the nails ¾ inches deep, or until there is enough space remaining between the nail head and the board to wrap string around the nail. These will be used to anchor the netting for the pole beans.
Stand one of the legs upright with the pointed end touching the ground. Place this end in the center of the row to be planted and pound it into the ground with the sledgehammer. Drive the leg to the 3-foot mark made earlier. Measure along the row with the measuring tape 6 feet and mark the spot. Place the second leg into the ground at this point, using the same procedure as you did with the first leg. Make sure the nails in the boards are facing nails of the opposite board.
Place the remaining board across the top of the two legs. Match up the ends of the boards and hammer the nails into the ends of the top board, attaching it to the legs. This produces your pole beam trellis frame.
Unwind about 6 inches of twine. Tie the end of the twine around the bottom nail of one leg on the frame. Pull the twine tightly across to the corresponding nail on the opposite frame leg. Wrap the twine twice around this nail. Pull the twine up to the next nail on this same leg, remembering to pull tightly as you go. Wrap the twine twice around this nail and pull the twine across to the corresponding nail. Continue this procedure until you have tied twine to all nails on the frame legs. Cut and tie the twine tightly at the last nail.
Tie the end of the twine to an end nail on the cross beam at the top of the pole trellis frame. Let the ball of twine drop to the ground. Pull the line tight, allowing 1 inch past where the twine reaches the ground. Cut the line with scissors at that point. Repeat the process for each nail along the top of the frame.
Loop the vertical line around each horizontal line it crosses until you reach the bottom line. Tie off the twine at the bottom horizontal line. Repeat this procedure with each vertical line. This creates the netting that the pole bean vines will grow up.