This kind of bulb does not always grow entirely below the ground

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A rhizome is actually a thickened stem growing partially or entirely below ground. Roots grow directly from its underside. The primary growing point is at one end of the rhizome; additional growing points form along its sides. Bearded iris is probably the best-known rhizomatous plant; others are calla lily (Zantedeschia) and canna.

New plants are produced from the growing points, so a planting that starts with a single rhizome can spread horizontally into the surrounding soil.

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