Agastache, Anise-Hyssop, Hummingbird Mint 'Black Adder'


Family: Lamiaceae (lay-mee-AY-see-ee) (Info)
Genus: Agastache (ah-gas-TAH-kee) (Info)
Cultivar: Black Adder
Additional cultivar information:(aka Blackadder)
Hybridized by Janssen
View this plant in a garden




Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Flowers are good for cutting

This plant is attractive to bees, butterflies and/or birds

Flowers are fragrant

Water Requirements:

Drought-tolerant; suitable for xeriscaping

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Grow outdoors year-round

Suitable for growing in containers


24-36 in. (60-90 cm)


18-24 in. (45-60 cm)


USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:

Full Sun


Unknown - Tell us

Bloom Color:



Bloom Time:

Late Summer/Early Fall




Other details:

Unknown - Tell us

Soil pH requirements:

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

7.9 to 8.5 (alkaline)

Patent Information:


Propagation Methods:

By dividing the rootball

From softwood cuttings

From semi-hardwood cuttings

Seed Collecting:

N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed


This plant has been said to grow in the following regions:

Richmond, California

Denver, Colorado

Washington, District Of Columbia

Brooksville, Florida

Deland, Florida

Atlanta, Georgia

Lula, Georgia

Saint Charles, Illinois

Hebron, Kentucky

Franklin, Massachusetts

Topsfield, Massachusetts

Wayland, Massachusetts

Harbert, Michigan

Pinconning, Michigan

Hopkins, Minnesota

Ocean Grove, New Jersey

Accord, New York

Coram, New York

Elba, New York

Elizabeth City, North Carolina

Greensboro, North Carolina

Geneva, Ohio

Hulbert, Oklahoma

Norman, Oklahoma

Malvern, Pennsylvania

Norristown, Pennsylvania

Conway, South Carolina

Knoxville, Tennessee

Belton, Texas

Conroe, Texas

Dallas, Texas

Houston, Texas

Centreville, Virginia

Leesburg, Virginia

Freeland, Washington

Kalama, Washington

show all

Gardeners' Notes:


On Sep 11, 2012, ms_greenjeans from Hopkins, MN (Zone 4a) wrote:

I live in zone 4a and have grown Blue Fortune, Golden Jubilee, Honey Bee Blue and Black Adder successfully in multiple places in my yard for 4-5 years. Black Adder has a slightly darker, more purple flower color that I like very much. All of my agastache get to be quite tall, like 5 feet or more, except for Golden Jubilee. We've had a couple of years of very hot, very dry weather here and this stuff doesn't skip a beat. I love agastache, and so do my neighborhood bees, butterflies and hummingbirds!


On Jul 26, 2012, Cahow from HARBERT, MI wrote:

I can't say enough nice things about the "Black Adder" variety of Agastache! I have a collection of uber-pricy tetraploid daylilies and NOTHING sets off their flowers better than a background of Black Adder's blue flowers, to contrast against the hot mango/vivid mustard/deep wine of my daylily's blooms. I started with 3 plants one year, saw how amazing they were, and bought 15 more to use all around the garden (I live on an acre). Very tidy, never floppy; mine grows from 2' to 3', depending upon the bed it's in. I have planted the generic agastache and it's too weedy and unkempt for my tastes; gets too big and flops over and stays flopped over without staking. This variety can withstand wind, rain, and my garden cats, who love to play in it. HIGHLY recommend >this< variety!


On Aug 18, 2011, Massgirl from Franklin, MA wrote:

Love this plant! Easy to grow, bees love it! BUT mine has grown 6 feet tall plus!!! I'm 5'7" and it's taller than me. This one I have in full sun, but I have a Blue Fortune in part shade and that one is 6' plus, too!! Since they are both so tall, they've flopped over but I've propped them up and they look beautiful.


On Apr 17, 2010, gardeningfun from Harpersfield, OH (Zone 5a) wrote:

This plant did fantastic in my zone 5a garden this winter. It is a huge mound already and very green and healthy looking. We had one of the worst winters and tons of snow and high winds. It was freezing and it came back great.


On Sep 29, 2009, stormyla from Norristown, PA (Zone 6b) wrote:

This is a wonderful plant with a very long bloom period. I have it growing in the windiest dryest section of my shady bed. It blooms very well under Maples and never bends in the wind.


On Feb 24, 2008, saya from Heerlen,
Netherlands (Zone 8b) wrote:

Hybridized by Coen Janssen (Netherlands). Probably a cross between A. rugosum and A. foeniculum. I've been told that most flowers are sterile. That explains the long flowering season.


On Nov 16, 2007, plutodrive from Denver, CO (Zone 5b) wrote:

This overwintered in my zone 5 garden. It is a great plant that likes it dry. Needs no care except for proper placement- well drained soil and sun.


On Jul 18, 2007, Marilynbeth wrote:

Beautiful Agastache! I've been growing it since 2005 or 2006.


On Mar 6, 2007, berrygirl from Braselton, GA (Zone 8a) wrote:

2-3 ft plants produce smoky-purple flowers from mid-summer well into fall. For an added bonus, in Autumn the stalks and foliage turn purple as well. Does great in containers. Perennial to zone 7.