Black Adder Giant Hyssop is an upright long-blooming perennial with aromatic blue-green foliage.  Densely packed upright spikes sporting near-black buds open to smoky violet flowers from early summer until frost attracting butterflies and hummingbirds.  Flowers best in full sun and moist well-drained soils. 

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.