In order to have an early production of onions, you need to plant sets or transplants in late March or early April. This means if you are starting onions from seed you need to get started in late January or early February. Onion sets need 6-8 weeks of growth before being planted outdoors. Onions are a good source of dietary fiber, Vitamin B6 and Folate, and a very good source of Vitamin C. Consider growing them in your landscape this year!