Bougainvillea is a tropical vine that is native to Brazil. It was brought to the United States in the late 18th century. With its spectacular mass of dark pink blossoms, bougainvillea is always a show stopper, whether trained on an arbor or trellis, or left to ramble up a fence or wall. If you choose to train your bougainvillea, it's a fairly simple process with very satisfying results.
Drive a tall stake or bamboo pole into the center of the bougainvillea. Wrap the bougainvillea vines carefully around the stake, shaping it as you go. Trim off any vines that grow to the side.
Tie the bougainvillea to the stake with a soft string or a piece of torn nylon stocking. The tie should be loose enough that it won't cut into the vine or impede its growth.
Train the vine as it grows, removing any extraneous vines. In time, the bougainvillea should grow around the stake without much help. The same technique can be used to train a bougainvillea on a trellis or arbor.