Line raised vegetable beds to control problems from burrowing critters such as moles and gophers. Depending on the type of animal you are trying to keep out, consider using a wide plastic mesh that will allow insect motion and not deteriorate like some metal wires. Other possible garden liners include hardware cloth or modern weed mat material.
Cut the lining material about 6 inches wider than than your raised garden bed. This will provide a 3-inch border on both sides to staple or nail to the side of your raised bed. If you are using a cloth or fiber-based liner, cut the liner with scissors. If you are using a stiff plastic or metal mesh liner, use a pair of tin snips to cut the liner.
Lay the lining material flat on the surface ground under your raised bed.
Press down on the liner until the 3-inch excess liner is pressed flat against the wood sides of your raised bed.
Staple or nail the 3-inch excess to the sides of the raised bed. Staple or nail the liner in place every 1 to 2 inches, especially if you are lining to prevent a mole problem.
Fill your bed with soil and plant your vegetables.