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
Other: Black licorice (anise) when crushed. Blue-green.
Flowers: Showy
Other: Bottlebrush-like
Flower Color: Blue
Other: Light violet-blue with dark purple bracts
Flower Time: Late spring or early summer
Late summer or early 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
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

Common names
  • Anise Hyssop
  • Giant Hyssop
  • Hummingbird Mint

'Black Adder' was a featured
Plant of the Day for May 4, 2019.
This plant is tagged in:
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  • 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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