Agastache Black Adder, commonly called giant hyssop, stands out with its upright, clump-forming structure that showcases tubular, 2-lipped, smoky red-violet flowers that bloom in magnificent bottle-brush terminal spikes, measuring 6-8 inches long. These flowers emerge from densely packed verticillasters (false whorls), creating prominent flower spikes, and have a striking origin from nearly black buds. Complementing these blooms are its aromatic, blue-green leaves, exuding an anise or licorice scent and shaped from lance-like to ovate. The plant's blossoms not only captivate the eye but also attract bees, hummingbirds, and butterflies. Deadheading can help prolong its vibrant display. Black Adder is a hybrid, resulting from a cross between A. rugosum and A. foeniculum. This blend of beauty and history makes it a remarkable addition to any garden, its one of our favorites!
Common Names: Hummingbird Mint, Giant Hyssop, Rock Anise Hyssop, Licorice Mint
Agastache Companion Plants: Geranium, Monarda, Nepeta
Black Adder Agastache Plant Care: Keep the plant well-watered for the first 4-5 weeks. After that, only water if the plant starts looking droopy. Leave the spent flowers on the plant throughout the winter as birds enjoy eating the seeds. It can be cut back to around 6 inches from the ground in early spring before the new growth starts. This is also a good time to apply fertilizer for the year.