True Hyssop is a frost-hardy herb from the Lamiaceae family that thrives across hardiness zones 3 through 11, making it one of the most cold-tolerant culinary and medicinal herbs you can grow. This open-pollinated variety reaches a compact 12 to 24 inches tall and grows beautifully in full sun to partial shade, adapting well to the slightly alkaline to neutral soils it prefers (pH 6.0 to 8.0). With seeds that germinate in warmth between 60 and 75 degrees Fahrenheit, True Hyssop can be started indoors 6 to 8 weeks before your last frost date or direct sown after frost danger passes, giving you flexibility in how you begin your growing season.
Partial Sun
Low
3-11
24in H x ?in W
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Moderate
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True Hyssop earns its place in herb gardens through a combination of hardiness and practical utility that few other culinary herbs can match. Its ability to survive winters in zone 3 while thriving all the way to zone 11 makes it genuinely exceptional, rewarding gardeners from cold northern climates to warm southern regions. The compact growth habit and low-maintenance nature mean you get a productive herb plant without constant fussing, and the slight alkalinity tolerance sets it apart from many herbs that demand acidic conditions.
True Hyssop serves as both a culinary and medicinal herb, with leaves traditionally brewed into teas and used in herbal preparations. The aromatic foliage brings a subtle, complex character to culinary applications, particularly in European and Mediterranean cooking traditions where it has been cultivated for centuries.
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Start seeds indoors 6 to 8 weeks before your average last frost date. Maintain soil temperatures between 60 and 75 degrees Fahrenheit for reliable germination. Press seeds into the surface without covering them, as light aids germination.
Transplant seedlings outdoors after your average last frost date when they are established and the soil has warmed. Space plants 12 inches apart. Hardening off seedlings by gradually exposing them to outdoor conditions over 7 to 10 days helps them transition successfully.
Direct sow seeds outside 2 to 4 weeks after your average last frost date by pressing them into the soil surface. You may also sow in late fall for spring germination in the following year.
Harvest leaves once the plant is well-established, typically after the first 6 to 8 weeks of growth. Pinch or cut leaf sprigs from the top of stems just above a leaf node to encourage branching. For fresh use, harvest in the morning after dew dries but before heat of the day sets in. For drying, harvest just as flowers begin to open, when essential oils are at their peak concentration.
Pinch back the growing tips of young plants to encourage bushier growth and fuller plant structure. Once established, light harvesting of leaves acts as natural pruning and promotes continued leaf production throughout the growing season.
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