Depending on the materials you have on hand, building a natural trellis may cost you nothing at all. If you do end up spending money, you will not have to spend a lot. Choose from a couple different options to match your garden's aesthetics. If you have a tree in your garden or neighborhood that has recently been pruned, you may have natural building materials already. Otherwise, bamboo poles are strong, sturdy, weather-resistant and sustainable. Traditional timber from your local hardware store will also work, but will be more expensive.
Measure the height and width of the area you want the trellis to cover. Draw the approximate size and shape of the trellis on a piece of paper using these measurements. Trellis size is best determined by the area you have to work with in your garden. Common trellis shapes include a square grid (similar to a tic-tac-toe board) and a fan. Make sure to plan for the bottom ends to dig into the ground. These will support the trellis and the plants growing on it.
Choose your building material. Fallen branches of sufficient height can be used, provided the wood is not diseased or rotted. Bamboo canes and thin, strong lengths of wood are also good options.
Cut the pieces of the trellis in accordance with your design. For a square grid, your pieces will all be the same length. For a fan, the vertical pieces will be longer, while the horizontal pieces will range from short at the bottom to long at the top of the trellis. Use a handsaw or a rotary tool with wood-cutting discs to cut the wood to size.
Lash a frame for your trellis into place with the clothesline. Whether you are using a square grid or fan design, lashing a frame together will make it much easier to lash the other pieces of wood into place. Use diagonal lashing to cover all sides of each pair of pieces of wood.
Lash the remaining pieces of wood onto your frame. Be sure each knot is secure before cutting the line.
Plant your trellis in your garden by stabbing it down into the ground. Use a mallet to lightly tap the top of the trellis so that the bottom slides neatly into the ground.