Companion Planting
Planting different crops in the proximity of peppers would help pest control, maximize space and increase crop productivity.
Plants that Grow Well with Peppers
There are some plants that do wonderfully when planted with peppers. These include basil, chives, carrots, onions, lettuce, spinach, okra, leeks, radishes, beets, asparagus and garlic.
Actually, just about any herb does extremely well when grown with peppers and some people actually report that they increase the yield of the plants around them.
Plants that Don’t Grow Well with Peppers
Bell peppers are a bit less persnickety than hot peppers and will grow well near just about anything other than fennel or kohlrabi. Hot peppers, on the other hand, are known to share some of their heat with fellow peppers so you may want to consider giving them their own planter.
Also, hot peppers shouldn’t be grown with beans, broccoli, cabbage, cauliflower, Brussels sprouts or fennel. They just don’t do well because of the different soil requirements.
As an aside, chili peppers have root exudates which help prevent root rot. In plants like tomatoes that are prone to root rot, this is a great reason to buddy them up.