Hyacinth bulbs don't usually live for more than about three or four years. If you'd like to propagate more hyacinth bulbs, wait until late summer and gently lift the bulbs. Remove the small offsets forming around the edges of the bulbs, and replant everything, including the original bulbs. Be patient, because it will take a few years for the offsets to bloom. Since the plants can disappear in mid-summer, mark their locations while they're still in bloom.