Blue Hyssop (Hyssopus officinalis) is a hardy perennial herb prized for its aromatic leaves and vibrant blue flower spikes. Traditionally used in herbal teas and remedies, Hyssop also serves as a striking ornamental for borders, rock gardens, and pollinator-friendly spaces. With its strong fragrance and long bloom season, Blue Hyssop is perfect for herbal wellness gardens and adds beauty as well as function.
Seed Information
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Type: Herb Seeds
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Common Name: Blue Hyssop, Common Hyssop
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Genus: Hyssopus
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Species: Hyssopus officinalis
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Life Cycle: Perennial
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Features: Fragrant foliage, blue flowers, herbal and ornamental use, pollinator friendly, drought tolerant
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Season of Interest: Summer to early fall blooming
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Indoor/Outdoor: Both (herbal gardens, borders, containers)
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Sunlight: Full sun
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Cultivating Difficulty: Easy to moderate
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Watering: Light to moderate, drought tolerant once established
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Climate: Temperate, Mediterranean
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Growth Habit: Upright clumping perennial, 18–24 in tall
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Soil Type: Well-draining sandy or rocky soil
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Soil pH: 6.0–7.5
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Planting Time: Spring after frost or fall in mild climates
Grow Instructions
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When to Plant: Sow indoors 6–8 weeks before last frost or direct sow outdoors in spring
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Soil: Well-draining, sandy or rocky soil, not overly rich
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Sunlight: Full sun (6–8 hours daily)
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Watering: Water moderately; allow soil to dry slightly between waterings
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Spacing: 12–18 inches apart
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Germination: 14–21 days at 65–70°F (18–21°C)
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Bloom Season: Mid-summer to early fall
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Tips: Prune after flowering to maintain shape and encourage new growth; suitable for containers and dry gardens