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The bulb. It's just like a tulip bulb you might plant in a garden. A bulb is made of modified leaves, so each layer of the onion and its paper are specialized leaf tissue. They are used by the plant as energy storage; at the end of the growing season the plant undergoes die-back where the above ground portion dies and the sugars from it get concentrated in the bulb. The energy stored is used to grow the plant back next season.

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14y ago

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