IN SEASON - June, September, October
Scallions are most commonly referred to as green onions in the United States. They are a variety of young onions with a long, thin white base that has not yet developed into a bulb and long straight green stalks that look like giant chives. Both the white base and the green stalks are commonly eaten.
Store in plastic bags in the crisper section of the refrigerator. They'll last up to five days. You can also stand them up in a mason jar with water with a loose plastic bag on top in the fridge.
Always use a sharp knife when cutting scallions to avoid bruising them. Cut off any dried out ends from the dark green tops, trim the root ends, and rinse just before using.