You decide. Although many peppers are strong plants that hold themselves upright, they sometimes need a little help. If you live in an area where the growing season is long, peppers often get taller than expected, maybe three feet tall. Also, in places prone to thunderstorms, a good wind or rain will quickly level a pepper-laden plant. Finally, varieties that produce large peppers appreciate the extra support under the weight of their bounty.
To stake, simply drive a 2- to 3-foot wooden, bamboo, or purchased garden stake at least 6 inches deep into the ground right beside the 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 stakes with soft twine or strips of stockings to avoid cutting into or scarring the stems.
You can also support peppers with a small wire tomato cage.