Answer: Onion sets are small bulbs that are best planted in the fall for harvest the following year. Onion plants are seedlings that are transplanted into the garden in the early spring and are ready to harvest in 65 days or less. They can be planted and harvested in the same growing season. Onions are a cool-season crop and, generally speaking, grow tops in cool weather and form bulbs when the weather warms. Seedling transplants are a good choice if you want results in a hurry.
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