Bulbs and tubers are both underground plant organs used to store nutrients and energy during dormancy, but they have completely different anatomical structures. A true bulb consists of concentric layers of fleshy, modified leaves attached to a compressed stem base (basal plate). Conversely, a tuber is a solid, swollen mass of stem or root tissue that lacks layers and reproduces via specialized growth buds known as “eyes”. Structural Differences
The core differences lie in how they are physically put together and how they grow: Tubers, Corms, Rhizonmes, and Bulbs | American Meadows
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