Photo by Melody
Are you up for a fun new challenge? Join our 2015 Grow-Along Challenge: Squash Wars and let's see how many new varieties we can grow this year!

PlantFiles: Hummingbird Mint
Agastache '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

8 vendors have this plant for sale.

16 members have or want this plant for trade.

View this plant in a garden


36-48 in. (90-120 cm)

24-36 in. (60-90 cm)

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

Soil pH requirements:
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly 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

Click thumbnail
to view:

By Marilynbeth
Thumbnail #1 of Agastache  by Marilynbeth

By KevinMc79
Thumbnail #2 of Agastache  by KevinMc79

By KevinMc79
Thumbnail #3 of Agastache  by KevinMc79

By Marilynbeth
Thumbnail #4 of Agastache  by Marilynbeth

By plutodrive
Thumbnail #5 of Agastache  by plutodrive

By saya
Thumbnail #6 of Agastache  by saya

By peachespickett
Thumbnail #7 of Agastache  by peachespickett

There are a total of 19 photos.
Click here to view them all!


8 positives
1 neutral
No negatives

Gardeners' Notes:

Positive ms_greenjeans 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!

Positive Cahow 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!

Positive Massgirl 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.

Positive gardeningfun 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.

Positive stormyla 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.

Positive saya 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.

Positive plutodrive 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.

Positive Marilynbeth On Jul 18, 2007, Marilynbeth from Hebron, KY wrote:

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

Neutral berrygirl On Mar 6, 2007, berrygirl from Braselton, GA (Zone 7b) 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.


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
Leesburg, Virginia
Freeland, Washington
Kalama, Washington

We recommend Firefox
Overwhelmed? There's a lot to see here. Try starting at our homepage.

[ Home | About | Advertise | Media Kit | Mission | Featured Companies | Submit an Article | Terms of Use | Tour | Rules | Privacy Policy | Contact Us ]

Back to the top

Copyright © 2000-2015 Dave's Garden, an Internet Brands company. All Rights Reserved.

Hope for America