Winter hardy to USDA Zones 8-10. In St. Louis, it should be grown as an annual in average, evenly moist, well-drained soils in full sun to part shade. It prefers organically rich loams. If grown in too much shade, plant stems tend to elongate and fall over. Plant height can be reduced by cutting back stems in late spring. Although species plants may be grown from seed started indoors before last spring frost date, this cultivar should be propagated from cuttings. Set out plants after last frost date. Deadhead spent flowers to encourage additional bloom. If desired, cut back and pot up several plants in fall or take cuttings in late summer for overwintering in a bright but cool sunny window. Plants grown in protected locations with winter mulch may survive mild winters in USDA Zones 6-7.
Salvia guaranitica is native to Brazil, Paraguay and northern Argentina. It is a tender perennial or subshrub that exhibits a bushy, somewhat open habit with upright, branching, square, dark green stems typically growing 3-5’ tall. When grown as an annual, plant height is shorter, more often in the 2.5-3’ area. Two-lipped, tubular, deep blue flowers (to 2” long) with purple-blue calyxes bloom in axillary and terminal spikes (to 10” long) from mid summer into fall. Ovate, wrinkled, pointed, lightly-toothed, dark green leaves (2-5” long) are pale green below. ‘Black and Blue’ is a cultivar that features deep cobalt blue flowers with black calyces. Flowers appear on spikes to 15” long over a long mid-summer to fall bloom. Plants may grow to as much as 6’ tall in optimum conditions where winter hardy, but usually grow much shorter in the St. Louis area. Plants are sometimes commonly called blue anise sage or anise scented sage. When bruised, the foliage has a very mild aroma that has very little if any anise scent.
Two lipped, tubular, deep cobalt blue flowers with black calyces bloom in showy axillary and terminal spikes from mid-summer to fall on this shrubby annual that typically grows to 2-3 feet tall. Plants are best grown in full sun to light shade. Foliage emits a mild anise aroma when bruised. This cultivar will not come true from seed and should be propagated by cuttings.
No serious insect or disease problems. Susceptible to downy and powdery mildew.
Beds, borders and cottage gardens. Containers. Annual for areas north of USDA Zone 8.
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