Raspberries grow on upright canes. The bushy canes quickly become overgrown and weak as they bend under the weight of the foliage and fruit. Providing support for the canes keeps them upright and strong. Proper support also makes the fruit easier to harvest and eases pruning in spring. A trellis system comprised of stakes and wires provides support for multiple plants and canes in both large and small raspberry plantings.
Install sturdy 6-foot stakes every 10 feet along the row of raspberry canes. Insert the bottom 10 to 12 inches of each stake into the soil so the stakes don't fall down under the weight of the canes.
Stretch a wire between the stakes 3 feet up from the ground. Tie the wire securely to each post, stretching it the length of the row. Attach a second wire at the same height and stretch it between the post on the other side of the canes, so the canes are sandwiched between the two wires.
Tie another wire near the top of the stake and stretch it down the row, attaching it to the other stakes. Repeat with a second wire at the same location to sandwich the canes between the two wires.
Tie the canes to the wires loosely with a cloth plant tie. The ties prevent weaker canes from bending and slipping out of the trellis system.
Raspberries require yearly pruning in spring to remove the old, no longer productive canes. Tie the new canes to the wires as soon as they are tall enough.
Do not tie the cane tightly to the wires or the wires may cut into the canes as the raspberry plant grows.