Threadleaf Giant Hyssop is a striking perennial herb native to the cool mountain slopes of Arizona and New Mexico, where it thrives at elevations between 5,000 and 7,000 feet. This upright, clump-forming plant grows 18 to 24 inches tall and 12 to 18 inches wide, crowned with showy spikes of salmon and burnt orange tubular flowers that bloom from July through September. The narrow, linear foliage carries a distinctive anise scent, adding aromatic appeal long before the flowers arrive. Hardy in zones 6 to 9, this drought-tolerant herb handles heat and dry soils with ease once established, while attracting hummingbirds and butterflies throughout the growing season.
Partial Sun
Moderate
6-9
24in H x 18in W
—
High
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Salmon and burnt orange flowers sit atop erect, salvia-like spikes reaching up to 12 inches long, creating an arresting vertical element in any garden. The narrow, anise-scented foliage distinguishes this threadleaf variety from its broader-leaved cousins, offering both visual delicacy and aromatic intrigue. Once established, it laughs at drought and heat while remaining low-maintenance, and it's genuinely attractive to hummingbirds and butterflies looking for nectar.
As an herb in the mint family, Threadleaf Giant Hyssop serves ornamental and pollinator-supporting purposes in gardens. The aromatic foliage can be dried and used for herbal infusions that carry subtle anise notes, though its primary value to most gardeners lies in its role as a nectar source and a visually compelling addition to borders, cottage gardens, and pollinator-focused plantings.
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Start seeds indoors 6 to 8 weeks before your last frost date, sowing them at a soil temperature between 60 and 75 degrees Fahrenheit. Press seeds lightly onto moist soil; they benefit from light for germination, so avoid burying them deeply.
Harden off seedlings over 7 to 10 days before transplanting outdoors after all danger of frost has passed. Space plants 12 to 18 inches apart in well-drained soil. Water gently after planting and maintain consistent moisture during the first growing season.
Direct sow seeds outdoors after the last frost date when soil temperatures reach 60 to 75 degrees Fahrenheit. Sow seeds on the surface or press them lightly into soil, as they require light for germination.
Deadhead spent flowers to promote additional blooming and maintain a neat, compact form. No major pruning is necessary; simply remove dead or damaged stems in spring as new growth emerges.
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