The spring onion is an onion variety that has a small white bulb, and long green leaves and stems. This crisp plant is a form of immature onion. They’re a more mature version of the vegetable known as scallions or green onion, which has a similarly long green stem, but has no bulb. They can be harvested at any stage but are mostly left until they develop a thick white base. They are usually eaten raw being chopped up and added to salads or fast meals such as stir fry or scrambled egg. Plant close together to form a clump.