Summer hyacinth are perennial bulbs planted in spring or fall. Northern zones should plant bulbs in the spring, remove them from the ground in the fall, and store in peat moss until time to replant the following spring. Zones with warmer climates should plant bulbs in the fall for summer blooming. Mulch will protect bulbs from unexpected weather changes.
Leaves of the mature summer hyacinth are strap-like and grow two to three feet long; up to 30 bell-shaped white flowers hang from the spike-like stems. Summer hyacinth prefer full sun and rich, loamy soil. They can propagated from seeds, but take years to produce flowers. The best propagation is done through division of bulbs. Summer hyacinth are commonly used in flower beds as group accents, borders, and cut flower arrangements.