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Black Adder Agastache

Agastache x 'Black Adder'
SKU: HC018213
per Plant - 5" Deep Pot
Shipping begins the week of February 26th, 2024
Agastache x ‘Black Adder’ (Giant Hyssop) is a large-statured hybrid that shows off plentiful periwinkle flower spikes all summer long. Long-blooming and easy-to-grow, this native cultivar is a great way to create large swaths of color and texture with fragrant blooms that will attract many pollinators.
key features
Botanical Name
Agastache x 'Black Adder'
Growing Zones
Zone 6, Zone 7, Zone 8, Zone 9
Bee Friendly, Attracts Butterflies, Attracts Hummingbirds, Attracts Beneficial Insects, Deer Resistant, Easy To Grow, Long Bloom Time, Dried Flowers, Fragrant, Autumn Interest, Mass Plantings, Rock Gardens
Soil Moisture
Waterwise, Average
Light Requirements
Full Sun
Mature Height
24-36" tall
Bloom Time
Summer to fall


Like most Agastaches, ‘Black Adder’ is a low-maintenance, drought-tolerant pollinator magnet. What sets it apart are the large bottlebrush terminal spikes packed with fragrant flowers. Long blooming, its spikey flowers add color, fragrance, and spunky texture to a garden setting. Blue-green foliage adds a lovely anise scent as well. A cross between A. rugosa and A. foeniculum, 'Black Adder' attracts hummingbirds, butterflies, bees, and other beneficial insects. Drought and heat-tolerant once established, plant en masse or mix into a perennial bed or rock garden, where it will flower from summer to fall, an excellent choice for late-season color. They make nice cut and dried flowers as well.