List Of How Deep Do You Plant Onion Sets Natural. How do you grow onions indoors? Dig a hole and pit the onion set bulb with the root end facing down and the tip facing upwards.
Plant the sets 2 to 3 inches apart for dried onions. The whole process, from harvesting material to harvesting, is divided into several successive stages. Plant the sets 2 to 3 inches apart for dried onions.