Start onions early , indoors, mid-February thru mid-March. Use flats or small inserts and a light weight potting mix with extra perlite. This allow for easy separation of the roots at transplanting time. Planting depth is ¼ inch. Germination is usually very quick. Transplant outside in late spring, being careful to not bury the seedlings too deep or start direct seeding at this time. Onions prefer rich light weight garden soil and evenly moist growing conditions, especially in the first month of growth.