Peas are cool-season legumes that need little ongoing care to thrive in your vegetable garden. Peas grow along vines, so they do require a support system that keeps the vines and developing pods off the ground. Many such supports are sold at garden centers. However, it's easy to create your own low-cost, homemade pea trellis. The trellis can be left up in your garden year-round, or stored and erected each spring at planting time.
Lay two 6-foot poles side-by-side. Lash the tops of the poles together with heavy twine. Repeat with a second set of poles. You will have two sets of two poles for either end of the bed. Make an additional set if your pea bed is more than 6 feet long.
Spread the untied ends of the poles apart to form the legs of an A-frame. Place a set poles on either end of the bed. Push the pole legs 4 to 6 inches into the soil. Erect any additional sets of poles in the center of the row, spacing these at approximately 6-foot intervals.
Lay a pole over the top of the A-frames so that it sets inside the crook formed by the tied pole ends on each set. Lash this in place to the A-frames.
Cut a piece of nylon or plastic garden netting to the length of the garden bed. Stretch the netting between the a-frames and tie it to both the legs and the top pole using twine or plastic zip-ties. Cut a second length of netting and attach it to the other side of the trellis frame so that your trellis has two sides to support plants.
Sow pea seeds 1 inch deep and 3 inches apart at the base of the netting on both sides. The vines should climb the trellis without any aid. However, you can weave the growing tip of the pea vine into the netting if it does not begin to climb on its own, according to the University of Minnesota.