5 Foods , You Can Grow in a Container Garden.br 1. Peppers.br Use a container that's about br 14 to 16 inches deep and secure br with twine to keep upright.br 2. Scallions.br Place the roots of store-bought scallions in a jar with br an inch of water for a week. After the roots grow, br remove the greens and plant the stem in soil.br 3. Radishes.br Scatter seeds over soil and cover lightly. br After one week, thin the seeds to about br one plant for every 2 inches of soil.br 4. Herbs.br Water once a week. Keep in a sunny spot inside br or outside and feed fertilizer once a month.br 5. Peas.