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Onion Planting Depth
Onion Planting Depth. Planting onions to the proper depth and spacing is essential for growing healthy, thriving onions. Planting onions too deep will prevent them from growing, while a shallow depth will cause them to surface prematurely.
Planting onions to the proper depth and spacing is essential for growing healthy, thriving onions. Planting onions too deep will prevent them from growing, while a shallow depth will cause them to surface prematurely.
Seeds
Plant onion seeds 1/4 inch deep, spaced 1/2 inch apart. Seeds can be planted directly outdoors three to four weeks before the last frost or indoors six to eight weeks before taking them out. Seeds require 10 weeks to reach transplanting size.
Sets
Plant onion sets, or small bulbs, directly in the ground to a depth of 2 1/2 inches. Space sets 1 inch apart until they reach transplanting size.
Transplants
Transplants, or seedlings, are planted 1 inch deep and spaced 3 inches apart. When seeds and sets reach transplanting size, thin the plants to 3 or 4 inches apart to allow room for bulb growth. Use the thinned plants for scallions.
