grape hyacinth, any plant of the genus Muscari of the family Liliaceae (lily family), low plants with dense spikelike clusters of small, nodding flowers that are usually deep blue. Of more than 50 Old World species several have been successfully cultivated and naturalized in the United States and are especially popular as rock-garden plants. Grape hyacinths are classified in the division Magnoliophyta, class Liliopsida, order Liliales, family Liliaceae.

Any of the approximately 50 species of small bulbous perennial plants that make up the genus Muscari, in the lily family, native to the Mediterranean region. Most species have dense clusters of blue, white, or pink urn-shaped flowers borne at the tip of a leafless flower stalk. Some species have a musky odour. Grape hyacinths often are planted as spring-flowering garden ornamentals.

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