Cut willow branches to the same length, using a handsaw.
Stick willow branches 1 foot apart into the ground where you want the fence to be. For a stronger fence, drive cedar wood posts 2 feet deep into the ground and 1 foot apart.
Weave willow branches horizontally into the vertical branches or posts.
Paint the fence or spray it with polyurethane spray to repel moisture for a longer-lasting fence.
Cut two willow branches to a length of 6 feet, using a handsaw. Cut two more willow branches to a length of 3 feet.
Place the longer willow branches 3 feet apart and parallel. Lay a 3-foot branch horizontally across the top of the longer willow branches and secure it in place with wire. Lay the other 3-foot branch horizontally 1 foot up from the bottom of the longer willow branches and secure it in place with wire. This is the trellis frame.
Lay willow branches horizontally across the borders of the frame every 4 inches and secure them to the frame with wire. Extend the lengths of the branches by tying them together with wire, if necessary.
Weave willow branches vertically through the horizontal branches every 4 inches and secure them to the frame with wire.
Dig two 1-foot-deep holes in the ground where you want the trellis to go. Stick the bottom ends of the trellis into these holes and pack dirt around them to hold the trellis in place.