Agastache x 'Black Adder' ~ Black Adder Giant Hyssop-ServeScape
Agastache x 'Black Adder' ~ Black Adder Giant Hyssop - Delivered By ServeScape
Agastache x 'Black Adder' ~ Black Adder Giant Hyssop-ServeScape

Black Adder Giant Hyssop

Agastache x 'Black Adder'

Regular price$10.72
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  • Guaranteed Locally Grown
  • Delivery to Greater Atlanta, GA, Greenville, SC & Tallahassee, FL area ONLY, within 5-7 business days. (Click HERE to see our Delivery Area Map)
  • Pickup in 3-5 business days from our Switchyard in Chamblee, GA       
    (Mon/Wed/Fri 11am-4pm - 3708 N Peachtree Rd, Atlanta, GA)
**Dormancy Note - This plant is currently dormant for the winter! It is available for purchase! Your delivered plant may be dormant, or showing very little top growth. However, you can still plant! These plants are putting all their energy into root production, so they will be ready to thrive in the spring! If you have any issues with your plant the following peak season, you can fill out our return request form to request a replacement plant.

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.




N. America


2' - 3'


1.5' - 3'



USDA Hardiness Zone: 

5 - 9


Full SunPart Sun

Bloom Color: 


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, BordersWoodland GardensNaturalized Areas, Foundational Plantings, and Containers.

COMPANION PLANTS: ConeflowerDaylily, Russian Sage

IMAGES: Photo by CAJC: in the PNW, Hyssop, (2) Photo by David J. Stang, Agastache Black Adder 4zzCC BY-SA 4.0

*As plants have ranges in appearance they may not appear as the images shown.

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