A giant yellow onion with a super sweet taste! Supersweet Onions can grow as large as softballs and often weigh 1 lb. each. They'll store well for 2-3 months. It is later maturing than other short-day varieties allowing it to grow farther north. Onions' growth is affected by the amount of light received. Short-day onions begin forming bulbs when daylight lasts 10-12 hours. Often, they are the sweetest onions and the best for eating raw and in salads or lightly cooked in salsas and stir-fries. They often do not store as well as long-day varieties. Because summer daylight hours are shorter in the South, short-day onions are most often grown in the South. Plant counts: A bunch contains 55-75 plants.