Onion sets are small, immature onions ... give a better yield of larger bulbs than if grown from seed. However the range of varieties available is far greater if growing onions from seed.

Plants grown from sets often begin blooming in mid-summer and stubbornly refuse to stop. Once that happens, onion bulbs don't increase much in size. This happens because onions are biennials.

There are two main ways you can grow onions — from seed and from sets. Growing onions from seed offers several advantages ...