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A Bulb Or Not A Bulb?: That is the Question!Many plants sold as "Bulbs," botanically are not. For those of you who like to know these things, here are the definitions and a few examples of each type: Bulb: A modified,much shortened shoot, enclosed by scale leaves and used to store food. Examples: Lillies and Crinums. Corm: Swollen stem base, used to store food. Examples: Gladioli and Freesias. Tuber: Modified swollen roots, used to store food. Examples: Dahlias and Begonia. Rhizome: A modified stem with scale leaves growing at or below ground level. Examples: Clivia and Canna.
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