A bulb is an underground vertical shoot that has modified leaves that are used as food storage organs by a dormant plant.
A bulb's leaf bases generally do not support leaves, but contain food reserves to enable the plant to survive adverse conditions.
The leaf bases may resemble scales, or they may overlap and surround the center of the bulb as with the onion.
A modified stem forms the base of the bulb, and plant growth occurs from this basal plate.
Roots emerge from the underside of the base, and new stems and leaves from the upper side.