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Don’t plant them in the same location year after year, as this can encourage the spread of diseases that affect the crop. Onions grown from seed require the soil to be at least 50☏ to germinate, so these should be started indoors about 6 weeks before transplanting to the garden. If you’d prefer to try this method, check out our tips for growing onions from seed. Of course, starting onions from seed is certainly doable and may even be necessary in colder regions (Zone 5 and colder).The onion sets look like small bulbs and are sold at gardening stores once they mature, they develop into full-size bulbs. Choose onion sets with bulbs that are 3/4 of an inch in diameter larger ones tend to produce stiff necks and go to seed. They can withstand light freezes and have a higher success rate than direct-sown seeds or transplants.

Onion sets are tiny onions that mature in about 14 weeks.

We prefer planting onion sets over starting them from seeds, simply because the sets establish quickly and are easier to plant. Should I Grow Onions from Seed or from Sets? See how to plant, grow, and harvest onions. Whether you start your onions from seed or from sets, there are some tricks of the trade that make the difference between a great crop and a disappointing one. Onions are planted early in the spring and harvested from midsummer through the fall.