noun
Refers specifically to the leek (Allium porrum), a vegetable resembling a large green onion. Often used in cooking contexts.
西洋ネギはスープによく使われる。
Leeks are often used in soups.
noun
Refers to chives (Allium schoenoprasum), a herb with thin green stalks. Less common than the leek sense; may be considered a secondary or less precise usage.
西洋ネギの花は紫色で美しい。
The flowers of the chive plant are purple and beautiful.