How to Grow Black and Blue Sage
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Black and Blue Sage
Salvia guarantica 'Black and Blue'
shrubBlack and Blue Sage is a striking ornamental shrub known for its deep blue-black calyces and vibrant blue flowers that bloom prolifically throughout the growing season. This tender perennial reaches 3-4 feet tall and wide, making it ideal for borders, containers, and Mediterranean gardens. It attracts hummingbirds and butterflies while requiring minimal maintenance once established.
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Example Black and Blue Sage timeline · Pittsburgh, PA (Zone 6b)
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Plant Black and Blue Sage
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Black and Blue Sage
Around Jun 16≈ 60 days after planting
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 8-11; grown as an annual in cooler zones or brought indoors for winter
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Seedling
2-3 weeksTiny seedlings with first true leaves emerging; very delicate and requiring high humidity.
Keep soil consistently moist but not waterlogged. Provide bright light without direct sun. Maintain 70-75°F temperature.
Juvenile Vegetative
3-4 weeksPlant develops multiple sets of true leaves, becoming stockier; reaches 4-6 inches tall.
Gradually increase light exposure. Begin hardening off if grown indoors. Can pinch stem tips to encourage bushiness.
Establishment
4-6 weeksPlant develops branching structure and deeper root system; 12-18 inches tall with dense foliage.
Plant outdoors after last frost. Water regularly but avoid overwatering. Apply balanced fertilizer monthly.
Mature/Sustained Bloom
6-8 months until first frostFull shrub covered with continuous flower spikes; plant reaches mature height of 3-4 feet.
Maintain moderate water and monthly feeding. Cut back by one-third in late summer for second flush of flowers. In zones 8-9, prune in late winter.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with insecticidal soap or neem oil; increase air circulation; use yellow sticky traps for monitoring.
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Mist foliage regularly to increase humidity; spray with water to dislodge; use neem oil if severe.
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Ensure good air circulation; avoid overhead watering; apply sulfur dust or fungicide if needed.
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Spray with strong water stream; use insecticidal soap; encourage natural predators like ladybugs.
Uses
Landscape Accent and Border Plant
OrnamentalBlack and Blue Sage is prized as an ornamental specimen for its striking two-tone flower color and extended bloom period. It serves beautifully in Mediterranean, cottage, and contemporary gardens as a focal point or massed planting. [source]
Hummingbird and Pollinator Magnet
WildlifeThe tubular blue flowers are irresistible to hummingbirds, butterflies, and bees, making it invaluable for pollinator gardens. It provides nectar from late spring through the first frost. [source]
Cut Flower Arrangement
HouseholdThe dramatic flower spikes last well in fresh arrangements, providing long-lasting color and interest to indoor displays. Their unique bicolor appearance adds visual intrigue to bouquets. [source]
Herbal Tea
CulinaryLike many Salvia species, Black and Blue Sage leaves can be dried and steeped into a mild herbal tea with subtle flavor. This traditional use capitalizes on the plant's aromatic properties. [source]
Traditional Herbal Properties
MedicinalSalvia guarantica has been used in traditional South American herbalism for various wellness purposes. Some species of Salvia contain compounds studied for potential antioxidant and cognitive support benefits. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
While not typically harvested for consumption, deadhead spent flower spikes regularly to promote continuous blooming throughout the season. Flowers are long-lasting in arrangements if desired. Cut back the entire plant by one-third in late summer for rejuvenation and a second flush of flowers. In zones 8-9, prune again in late winter before new growth emerges.
Fun Facts
- 🌱 The cultivar name 'Black and Blue' perfectly describes the flower's stunning appearance: the calyces (outer sepals) are deep black-purple while the tubular petals are brilliant blue, creating a striking bicolor effect.
- 🌱 Salvia guarantica is native to South America, particularly Argentina and Paraguay, where it thrives in warm, dry conditions—explaining its preference for full sun and well-draining soil.
- 🌱 This plant can be overwintered indoors in cooler zones by bringing potted specimens inside before the first frost and placing them in a bright, cool location (50-60°F), then moving back outside after the last spring frost.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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