Blue Spike Sage Salvia uliginosa

Sky-blue (or bog) sage is an open, upright, spreading species of Salvia, sometimes listed as a half-hardy annual, native to Brazil and northern Argentina. The genus name Salvia is derived from the Latin term salveo, which means ‘be well’ and refers to the plant's medicinal properties. It is a member of the Lamiaceae (mint) family and grows 4 to 5 feet in height and 4 to 8 feet in width. 

This salvia performs best in full sun and thrives in damp to boggy soil. It tolerates poorly drained soils, but will also grow well in ordinary garden soil. 

Its ornamental appeal is the continuous display of small, clear, sky- blue flowers produced on the upright spikes. The flowers open in the morning and fall by late afternoon in hot weather but are replaced by newly opening flowers the next morning. Blooming from spring through summer, the blue flowers attract butterflies, hummingbirds, and bees. 

Use this sage in a mass planting in riparian or naturalized areas. It is also a wonderful addition to a butterfly, cottage, or pollinator garden. It is best planted at the back of the border as it could benefit from staking or mixing with other plants to hold it upright. 

Insects, Diseases, and Other Plant Problems: No significant insect or disease problems. However, it may become weedy in wet soils, spreading underground by rhizomes.

VIDEO Created by Elisabeth Meyer for "Annuals, Perennials, Vines, and Groundcovers" a plant identification course offered in partnership with Longwood Gardens. 

More information on Salvia.