Red Onion
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Red onions (Allium cepa) are biennial bulbs grown as edible plants worldwide. Onion plants have long, hollow green leaves that emerge from an underground stem with shallow roots.
plant red onions outdoors in a spot with full sun, meaning six to eight hours of sunlight each day. Red onions grow best with an inch of rainfall each week, so you'll want to water deeply once or twice per week, depending on weather conditions.
Plant red onion sets one to two inches deep and two to six inches apart in rows 12 to 18 inches apart.