WM Vanderschoot Hyacinths with Glass Forcing Vases, 3 Bulbs Easy-to-grow hyacinth bulbs; November through January planting Package contains 3, 17/18-cm, top-size bulbs and 3, glass forcing vases; flowers bloom in 4 to 8 weeks Grow 18 to 30 inches high; prefer full/filtered, indoor sunlight Imported from Holland; packaged set measures 10 by 9 by 9 inches; weighs 4 pounds A great Holiday gift. Guaranteed to grow.