Bunching onions, sometimes called green onions, are frequently used in salads for their light, tangy flavor. Bunching onions are actually an immature version of a normal onion, picked before it has a chance to grow to full size. Unlike scallions, bunching onions have a slight bulb at the end. The plant doesn't require a lot of room to grow, so it's possible to cultivate bunching onions indoors.
Fill two pots with planting compost or soil. Choose neutral pH or slightly acidic soil. Make sure the pots are at least 6 inches deep and around 8 inches wide, with large drainage holes in the bottom.
Push holes 1/3 inch deep into the soil with your finger. Space the holes approximately 1/2 inch apart. Insert a seed into each hole in one of the pots and cover with a light sprinkling of soil. Leave the other pot as it is for now.
Water the pot containing seeds using a spray mister. Keep the soil damp over the next two weeks.
Plant germinated seeds in the second pot the same way as you planted the seeds. The seeds should germinate around ten days after planting.
Harvest your bunching onions four to six weeks after shoots first appear, or when they are around 10 inches tall.