Salvia guaranitica ‘Black and Blue’ is still one of the most popular salvias, and it’s really easy to see why. Salvia guaranitica is a tender perennial that is hardy in zones 8-10. In the Philly area, it’s planted mostly as an annual, and if it comes back next year, it’s just an added bonus. If you really want it to come back, make sure it’s in a protected area and mulched prior to winter.
This foliage is both fragrant (the common name is anise-scented sage) and attractive. The plant needs full sun, and will grow 2-5’ tall. If you want to keep the plant full and shorter in stature, make sure it’s in full sun and you can also cut it back the stems in late spring. Deadheading these will encourage more of the vibrant cobalt blue flowers with black calyces to rebloom from mid summer all the way through fall.