Raspberries are a good choice to grow in the home garden. They grow on 3- to 4-foot canes that need support, usually by some type of trellis. This keeps the canes from flopping over onto the ground and increases yields. Raspberries grown on a trellis can yield about three to five pounds of berries for every 5 feet of row, if well-cared for under optimal growing conditions.
Dig a hole every 15 feet along the row of raspberries. Position the holes so that they are centered along the row, with raspberry canes growing on either side of them. Use a post hole digger and make the holes about 2- to 3-feet deep. Angle the post hole digger so you make the bottom of the hole a little wider than the top of the hole. This will help keep the frost from heaving the concrete out of the ground.
Set fence posts into the holes.
Mix the quickset concrete following the manufacturer's directions. Mix enough for one post hole at a time.
Pour the concrete into the post hole. Add enough extra concrete so that it forms a mound that is about 2 inches high. The mound shape will allow rainfall to drain away from the post.
Hold the post in one hand and lay a 4-foot carpenter's level along the length of it with the other hand. Make sure the post is plumb, with the bubble of the level in the center of the gauge, and hold it for several minutes until the concrete hardens enough to hold it steady. Gently release the post and observe whether or not it moves. If it does not move, the concrete is hard enough to hold the post upright until it hardens thoroughly.
Repeat Steps 3 through 5 for the remaining posts.
Attach metal eye bolts to the posts. Put them on the two sides that face another post, so wire can be strung between the two posts. Secure a metal eye 24 inches above the ground and another one that is 42 inches above the ground.
Attach heavy gauge wire between the posts, securing it to the metal eye bolts. The wire should be taut, but doesn't have to be tight.
Train raspberries by supporting them with the wires. Tie the canes as they grow and spread them out along the wires so each one gets the maximum amount of sunlight.