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Bulbs, corms, rhizomes and tubers are sometimes mistaken for one another, or often all are lumped together as bulbs. There are differences between each:

Tubers are stems or roots with a swollen, irregular shape. Each year, new leaves and flowers are produced, and the leaves die down after flowering is completed.

Corms are stem bases, and are also irregular and swollen in shape. They often have a dry outer layer (known as a “tunic”). They produce new leaves each year.

Rhizomes are underground stems. The stems grow horizontally and are swollen in appearance. Leaves grow anew each year and fall back when the rhizome goes dormant.

Bulbs are actually storage growths that form from leaf bases or modified leaves. They often have a tunic. Bulbs, too, produce new leaf growth that dies down each year.

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