Black Adder Giant Hyssop, also known as Agastache 'Black Adder', is a perennial plant that is known for its striking, dark blue-purple flowers and its attractiveness to pollinators. This plant typically grows to a height of 2-3 feet with a similar spread. It prefers full sun and is adaptable to a variety of soil conditions, but it thrives best in well-drained, fertile soils. Black Adder Giant Hyssop is also drought-tolerant once established, making it a great choice for xeriscaping or low-water gardens. The flowers of Black Adder Giant Hyssop are dark blue-purple and appear on tall spikes from midsummer to early fall. The leaves are aromatic and have a minty fragrance when crushed. Type: Perennial Orgins: N. America Height: 2' - 3' Spread: 1.5' - 3' Spacing: 1.5' USDA Hardiness Zone: 5 - 9 Culture: Full Sun, Part Sun Bloom Color: Purple Season of Interest: Summer, Fall MAINTENANCE NEEDS: Low maintenance. Crown and root rot may occur in poorly drained soils. No serious pests or disease issues but watch for powdery mildew, wilt, and rust. LANDSCAPE USES: Accents or Group Plantings, Borders, Woodland Gardens, Naturalized Areas, Foundational Plantings, and Containers. COMPANION PLANTS: Coneflower, Daylily, Russian Sage IMAGES: Photo by CAJC: in the PNW, Hyssop, (2) Photo by David J. Stang, Agastache Black Adder 4zz, CC BY-SA 4.0 *As plants have ranges in appearance they may not appear as the images shown.
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