Grape Hyacinth – Muscari armeniacum, M. botryoides
Muscari armeniacum, M. botryoides, mus-KAH-ree ar-MEN-ee-ah-kum
Depends on cultivar and especially on temperature. For example, 'Harmony' lasted 5 days when held at 79F and 10 days at 64F. Most should last 2-3 weeks if sold at the first sign of flower color and held in cool environments.