Onions are interesting plants in that the whole plant is edible. And they are usable at any stage of their development. The bulbing types tend to bulb when the days are of a certain length. That is why we hear of short day onions and long day onions. Onions are a cool weather plant. They tend to falter if it gets too hot. So we plant short day onions in the South since they can be planted very early and mature whole the days are short and before it gets too hot. In the North we have to plant later so we use long day onions which will mature when the days are long. (June/July)
The Winter or Egyptian onions are a great addition to the garden. If you have a couple of clumps of these, you always have onions. You can use the mature onions, or plant the bulbils to grow scallions, or eat the bulbils. They are hardy, live through our winters, and may well be the first harvest of the season as Joseph has demonstrated.
Have a great day, and yes, plant onions.
Gardening at 5000 feet elevation, zone 4/5 Northern Utah, Frost free from May 25 to September 8 +/-