Bell peppers can be grown indoors if the right conditions are created. The Arizona Cooperative Extension recommends planting "small-fruited" peppers for indoor gardening. Peppers grown inside are easier to maintain than outdoor plants; however, special steps must be taken to provide the amount of humidity and sunlight needed for optimal growth.
Plant indoor pepper crops during the same time period that you plant outdoor crops. Choose a rich, lightweight soil made specifically for container gardening and fill an appropriate container with soil. The Arizona Cooperative Extension recommends using a 2-gallon container for peppers.
Sow bell pepper seeds directly into the container according to the directions on the seed packet or transplant one seedling into the pot. Water thoroughly.
Fill a large tray with decorative stones and place it in a south-facing window that receives six to eight hours of full sun each day. Set the potted pepper on top of the stones. Provide humidity and water for the peppers by filling the tray with water as needed.
Check your bell pepper for disease and insects just as you would an outdoor plant. Move the pepper outdoors if it requires a pesticide treatment. Watch for yellowed or dried leaves which may indicate the plant is being burned by light reflecting off the window surface. Move the pepper to a shadier place during the hottest part of the day if this is happening.
Fertilize your pepper with an organic or slow-release product as needed. Do not over-fertilize. Container plants are especially vulnerable to fertilizer burn.
Harvest your bell peppers in approximately 110 days.