General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun
Full Sun to Partial Shade
Water Preferences: Mesic
Soil pH Preferences: Neutral (6.6 – 7.3)
Minimum cold hardiness: Zone 6a -23.3 °C (-10 °F) to -20.6 °C (-5 °F)
Maximum recommended zone: Zone 9b
Plant Height: 24-36 inches
Plant Spread: 18-24 inches
Leaves: Deciduous
Fragrant
Other: Black licorice (anise) when crushed. Blue-green.
Flowers: Showy
Fragrant
Other: Bottlebrush-like
Flower Color: Blue
Other: Light violet-blue with dark purple bracts
Flower Time: Late spring or early summer
Summer
Late summer or early fall
Fall
Other: Deadhead faded flower stems to ensure more flowering throughout the season. To frost.
Suitable Locations: Xeriscapic
Uses: Cut Flower
Dried Flower
Suitable as Annual
Wildlife Attractant: Bees
Butterflies
Hummingbirds
Resistances: Deer Resistant
Rabbit Resistant
Drought tolerant
Propagation: Seeds: Can handle transplanting
Other info: Sterile
Propagation: Other methods: Division
Containers: Suitable in 3 gallon or larger
Needs repotting every 2 to 3 years
Needs excellent drainage in pots
Awards and Recognitions: Other: 2014 Great Plant Picks award winner
Parentage: Agastache rugosum x Agastache foeniculum

Image
Common names
  • Anise Hyssop
  • Giant Hyssop
  • Hummingbird Mint

'Black Adder' was a featured
Plant of the Day for May 4, 2019.
Photo Gallery
Location: West border
Date: July
Black adder blooms for more than 2 months
Location: My Northeastern Indiana Gardens - Zone 5
Date: 2011-10-10
Location: zone 8 Lake City, Fl.
Date: 2016-05-07
Location: West border
Date: July 2015
Someone needs to tell this plant it's only supposed to be 24-36 i
Location: My Northeastern Indiana Gardens - Zone 5
Date: 2011-10-10
Bee magnet!
Location: My Northeastern Indiana Gardens - Zone 5b
Date: 2012-08-05
#Pollination
Location: RHS Harlow Carr, Yorkshire, UK
Date: 2020-10-17

#Pollination
Location: My garden in Kentucky
Date: 2014-06-30
Bees love this Agastache! #Pollination
Location: RHS Harlow Carr, Yorkshire, UK
Date: 2021-08-14
Location: My Yard
Date: 2016-07-16
Location: Garland (Dallas), TX
Date: 2014-10-18
Location: Clinton, Michigan 49236
Date: 2017-10-28
Agastache 'Black Adder', 2015, giant hyssop, uh-GASS-tuh-kee, 2x2
Location: zone 8 Lake City, Fl.
Date: 2016-05-29
Location: My garden in Kentucky
Date: 2014-06-30
Bees love this Agastache! #Pollination
Location: My garden in Kentucky
Date: 2014-06-30
Bees love this Agastache! #Pollination
Location: Hamilton Square Perennial Garden, Historic City Cemetery, Sacramento CA.
Date: 2015-07-12
Zone 9b.
Location: West border
Date: July
Always buzzing
Location: RHS Harlow Carr, Yorkshire, UK
Date: 2021-08-14
Location: My garden in Kentucky
Date: 08-01-2015
#Pollination
Location: Wallsend, Tyne and Wear, England UK 
Date: 2020-05-07
Agastache 'Black Adder'
Location: West border
Date: 2015-08-31
Monarchs LOVE this plant

Date: 2012-07-28
Location: my garden 
Date: 2014-08-01
Location: My garden in Kentucky
Date: 2011-07-09
Location: My garden in Kentucky
Date: 08-01-2015
#Pollination
Location: My Northeastern Indiana Garden - Zone 5b
Date: Sep 22, 2011 1:58 PM
First Year Bloom
Location: Garland (Dallas), TX
Date: 2014-10-18
Location: My Northeastern Indiana Gardens - Zone 5b
Date: 2012-08-05
Swallowtails love the nectar from this plant!
Location: My garden in Kentucky
Date: 2013-09-21
Location: My garden in Kentucky
Date: 2013-09-21
#Pollination
Location: West border
Date: October
Three full months of bloom from this wonderful agastache!
Location: Denver Metro CO
Date: 2013-08-23
New plant, August 2013
Location: My garden in Kentucky
Date: 2015-04-09

Photo courtesy of Annie's Annuals and Perennials
Location: Annie's Annuals Nursery
Photo courtesy of Annie's Annuals and Perennials
Location: Clinton, Michigan 49236
Date: 2017-10-28
Agastache 'Black Adder', 2015, giant hyssop, uh-GASS-tuh-kee, 2x2
Location: My garden in Kentucky
Date: 2013-09-21
#Pollination
Location: my garden 
Date: 2014-08-01
Location: My garden in Kentucky
Date: 2010-06-24
Location: My garden in Kentucky
Date: 2010-06-24
Location: My garden in Kentucky
Date: 2010-06-24
Location: My garden in Kentucky
Date: 2013-09-21
Location: My garden in Kentucky
Date: 2013-09-21

Photo Courtesy of Lazy S'S Farm Nursery.
  • Uploaded by Joy
Location: My garden in Kentucky
Date: 2013-09-06
Location: My garden in Kentucky
Date: 2013-09-06

Photo courtesy of Annie's Annuals and Perennials

Courtesy Crownsville Nursery
  • Uploaded by vic

Date: 2016-08-24
Photo courtesy of Santa Rosa Gardens. Used with permission.
Location: Denver Metro CO
Date: 2013-08-23
New Plant, August 2013

Photo courtesy of Santa Rosa Gardens. Used with permission.
Location: My garden in Kentucky
Date: 2010-07-09
This plant is tagged in:
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Comments:
  • Posted by Marilyn (Kentucky - Zone 6a) on Mar 15, 2013 11:00 PM concerning plant:
    I love Agastache 'Black Adder'! I love to see the Butterflies, Bees and/or Hummingbirds on it, getting nectar from it. I have at least three plants in my front yard flowerbed and I am getting two more to plant there.

    It is a beautiful and colorful Agastache! Easy to grow if you have excellent drainage and sun. Other than that, it is undemanding and happy.

    It warms my heart to see them on it!

    Another wonderful Agastache! Can't have too many of them in my yard!
Plant Events from our members
chelle On April 9, 2015 Obtained plant
Replacement plant. Previous plants perished winter of 2013/14.
piksihk On March 14, 2016 Plant Ended (Removed, Died, Discarded, etc)
piksihk On August 4, 2014 Bloomed
HamiltonSquare On October 27, 2017 Plant Ended (Removed, Died, Discarded, etc)
flaflwrgrl On October 7, 2015 Obtained plant
From Santa Rosa Gardens 2 plants.
GaNinFl On April 13, 2016 Obtained plant
Received from Santa Rosa Gardens
» Post your own event for this plant

Discussion Threads about this plant
Thread Title Last Reply Replies
Very nice, Marilyn by SongofJoy Jul 2, 2014 4:33 PM 5
What are you feeding that thing? by GaNinFl Feb 18, 2016 6:08 AM 2
Great photo! by amyscoutmom Jun 23, 2017 7:42 AM 0

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