Blue Sage is a shrubby perennial that brings stunning azure-blue flowers to gardens from midsummer through fall. Hardy in zones 5 through 9, this plant typically grows 2 to 5 feet tall and 2 to 4 feet wide, thriving on moderate water and minimal fuss. The flowers arrive in dense spikes on stiff stems clothed with narrow, grayish-green leaves, and they bloom prolifically over 125 days of the growing season. It's equally at home in formal hedges or casual borders, and pollinators flock to it.
12
Full Sun
Moderate
5-9
60in H x 48in W
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Moderate
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Deer leave this plant completely alone, and butterflies and bumblebees visit constantly throughout the blooming season. The azure-blue, two-lipped flowers arranged in whorls along tall spikes create a striking vertical accent, and the plant tolerates drought, poor soil, and urban grime with equal grace. Unlike many sages that sulk in rich soil, this one actually prefers lean, well-drained conditions and handles heat and humidity better than you'd expect from a blue-flowered plant.
Blue Sage shines as a hedge plant and structural element in perennial gardens, where its tall spikes provide height and movement. The fragrant flowers make it valuable for pollinator gardens and cottage-style plantings, while its drought tolerance and poor-soil acceptance suit it to naturalized prairie gardens and tough spots where other plants struggle.
No timeline data available yet for this variety.
Start seeds indoors 8 to 10 weeks before your last spring frost date. Sow 1 to 2 seeds per pot on the soil surface and keep consistently moist until germination. Provide warm conditions and bright light after sprouting, and harden off seedlings for 7 to 10 days before transplanting outdoors.
Transplant after all danger of frost has passed and soil has warmed. Space plants 12 inches apart in full sun with well-drained soil. Water gently at planting and keep soil evenly moist for the first 2 to 3 weeks while roots establish.
Direct sow seeds in spring after the last frost date, pressing them lightly into the soil surface. Keep soil consistently moist until seedlings are 2 to 3 inches tall.
Cut stems back by up to half their length in late spring to promote a compact, bushier form and prevent stem flopping, which is common in this variety. Remove spent flower spikes throughout the blooming season to encourage continued flowering through fall. If foliage becomes unsightly during hot summers, you can cut the plant back more aggressively; it will recover and rebloom.
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“Blue Sage, scientifically called Salvia azurea, is native to the prairies and open woodlands of the southeastern United States, ranging from North Carolina and Tennessee south to Florida and Texas, with some populations extending west to New Mexico and north to Nebraska. The species has been selected and propagated for gardens because of its exceptional hardiness and reliable bloom, particularly the grandiflora variety, which represents gardeners' effort to preserve and enhance the most vigorous forms for northern cultivation.”