Starting Onions IndoorsIf grown from seed, onions need to be started indoors 10 to 12 weeks prior to the transplant date. Onions are typically planted in mid- to late-March to avoid the summer heat. Place seeds one half to one inch apart in a tray filled with seed-starting media. Keep the tray in a warm location (75-80 degrees F) until seeds germinate. When the seedlings...
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