You decide. Although many peppers are strong plants that do a good job at holding themselves upright, they sometimes need a little help. If you live in an area in which the growing season is long, peppers tend to grow taller (sometimes three or more feet) than they would otherwise. Also, in places prone to thunderstorms, a good wind or strong rain can quickly level a pepper-laden plant. Finally, varieties that produce large peppers appreciate the extra support under the weight of their bounty.
To stake pepper plants, simply drive a 2- to 3-foot wooden, bamboo, or other sturdy-material garden stake at least 6 inches deep into the ground right beside each plant. (The best time to do this is when you set out the plant so that the roots aren’t disturbed later.) Tie the stems to the stakes with soft twine or strips of old nylon stockings to avoid cutting into or scarring the stems.
You can also support a pepper plant with a small wire tomato cage.