Spring onions are comprised of small round to oval bulbs, averaging 2 to 5 centimeters in diameter, attached to a straight, layered stalk of overlapping leaves. The bulbs are smooth, firm, crisp, and succulent, found in bright white to red hues, depending on the variety. There may also be a cluster of fresh, flexible, and fine tan roots attached to the bulb's base. The slender, tubular leaves have a stiff, thick, and crunchy consistency and are hollow, bearing dark green hues on the edges and lightening to a pale green tone near the bulb. Spring onion bulbs contain sugars and are absent of the gases developed in more mature bulbs, creating a sweet and mild, mellow flavor. The leaves have a stronger taste and contribute herbaceous, pungent, and grassy nuances.