Korean hyssop (Agastache rugosa), also called wrinkled giant hyssop or purple giant hyssop, is a bushy, 4-foot-tall perennial native to East Asia. It has strongly mint-and-licorice-scented leaves and short spikes of lavender-blue flowers from midsummer to early fall. Unlike most agastaches, it tolerates more moisture and humidity, making it suitable for climates outside the arid West.
Full sun, moist, well-drained soil. Divide clumps in spring. Attracts bees, butterflies, hummingbirds. Occasional downy mildew. Use in beds, borders, herb gardens. Fragrant foliage, showy flowers. Clump-forming, moderate grower. Hardy in USDA zones 4-8.
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