Smoke Camp Crafts Live Onion Plant Start Collection - Red, White, and Yellow Onion Plants in 2.5-inch Pots - Onion TrioThe perfect selection of onions for small gardens or windowsills. You will receive three 2. 5 inch pots, each containing 3 6 plants each of red, white, and yellow onions. Leave in the pots to harvest for green onions, or plant in a garden or raised bed in full sun for mature onions in late summer. Well drained, evenly moist soil is favored by onions. Onions are ready for harvest when their tops have yellowed, fallen over, and dried out.