The plant dies after the dramatic flowering is over, but distributes plenty of seed for a show in following years. Most grow 12 to 24 inches tall and bloom in late spring to early summer for a long period. If the old bloom stalks are cut back promptly, they will rebloom through fall. May Night' was selected as the 1997 Perennial Plant of the Year by the Perennial Plant Association. Blue Hill' has true blue blossoms.
Bog sage is an open, upright plant with clear sky blue flowers along graceful arching stems.
It booms throughout the summer. Unlike most salvias, it thrives in damp to boggy soil, although it will grow well in ordinary garden soil also. It is ideal for the back of a flower border, where shrubs or sturdy-stemmed perennials can support its rather lax habit. The thin stems grow 4 to 5 feet tall. This information is supplied with the understanding that no discrimination is intended and no endorsement by the Clemson University Cooperative Extension Service is implied.