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Black Adder Agastache Plant

  • - Giant Hyssop, Hummingbird Mint
  • - Agastache x 'Black Adder'
  • - Height: 2-3 feet
  • - Hardiness Zone: 5-9
  • - Exposure: Full Sun
  • - Bloom Time: July-September
  • - Each Quart contains 1 Black Adder Agastache Plant
Plant Features

Black Adder Agastache charms with long-blooming, smoky violet brushstrokes on dark buds, luring pollinators and adding spice to your garden. Born from a passionate union of Agastache rugosum and Agastache foeniculum, Black Adder Agastache rises like a fragrant exclamation point in the garden. Reaching a stately 2-3 feet, its upright, clump-forming habit exudes a sense of controlled chaos, a promise of untamed beauty soon to unfold.

Thriving in the warm embrace of Hardiness Zones 5-9, Black Adder basks in the unfiltered adoration of the sun, demanding at least six hours daily. Well-drained soils, even the sandy kind, become its loyal subjects, providing the perfect stage for its dramatic performance. And what a performance it is! From July to September, the air vibrates with the intoxicating whispers of anise and licorice, a siren song beckoning pollinators from afar. Then, from nearly black buds, unfurl smoky-lilac flowers, like artist's strokes dancing across the canvas of summer. Densely packed in verticillasters, these 6–8-inch brushstrokes form captivating spikes, a kaleidoscope of violet hues set against a backdrop of deepest indigo. But Black Adder's allure goes beyond mere beauty. Its lance-like to ovate leaves, cloaked in blue-green finery, offer a textural counterpoint to the floral fireworks. And like a maestro conducting an orchestra, Black Adder conducts the symphony of the senses, filling the air with fragrance, attracting a vibrant entourage of hummingbirds and butterflies, and painting the late-summer landscape with its intoxicating beauty.

Owning a Black Adder Agastache is like inviting a touch of the wild into your garden. It's a plant that begs to be experienced, its every inch a testament to the magic that unfolds when nature and drama collide. So, if you seek a plant that's both captivating and carefree, one that will set your garden ablaze with color and life, then look no further than Black Adder Agastache. Let it weave its intoxicating spell and watch your garden transform into a haven for the senses.

Attribute name Attribute value
Plant Needs
Sunlight 6+ hours
Soil Moisture Moist to Dry
Soil Properties Well-drained
Tolerates Sandy soil
Fertilizer When transplanted and then once every Spring
Attribute name Attribute value
Plant Characteristics
Height Category Tall
Mature Spread 18-24 inches
Habit Upright
Flower Color Blue, Purple
Foliage Color Green
Attracts Bees, Butterflies, Hummingbirds
Features Cut Flower, Drought tolerant, Heat tolerant
Garden Styles Butterfly Garden, Container Garden, Cottage Garden, Pollinator Garden, Prairie Garden, Roof Garden
Plant Used for Aesthetic Appeal, Borders and Edging, Edible, Focal Point, Healing and Medicinal, Thriller, Water Conservation
Critter Resistance Deer
Pet Friendly Yes
Plant Type Hybrid

Product Reviews


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Top Reviews

Hopefully a hummingbird magnet

Got 2 of these late in the growing season. Hopefully they’ll be a nice attraction for the local hummingbirds next year when they return. As always grow joy sent me 2 healthy plants.

From Trystan | October 31, 2021

Giant Hyssop

Plant arrived well packaged as usual, moist, green and full of roots. It is always exciting to get plants from Grow Joy and bring joy into your life. Bobbie

From Bobbie | October 06, 2021

Healthy Plants!

I ordered the agastache plant along with two other pollinator plants. They arrived in a single box and in good condition. I previously purchased a black adder from another company as a bare root product but it never sprouted even though I followed all planting instructions. I was excited to see live plants available from GrowJoy. I transplanted them from their quart size pots into larger planters and all three plants are thriving. I'm very pleased with my purchase and plan to buy from GrowJoy again.

From Jennifer | July 07, 2020

Black Adder Agastache Plant (Hummingbird Mint)

These healthy Hummingbird Mint plants have grown so big and full, with lots of blossoms, and I can't wait to see them in full bloom! Nancy G.

From Nancy | July 17, 2019

Black Adder Agastache Plant

Got a couple of these late last year and 1 stayed alive during the winter - is growing big, fast and will be blooming any day now. Love this company.

From George | May 11, 2019

healthy plants

Nice size well rooted plant.It shipped the day after I ordered and was very well packaged.

From susan | September 07, 2018


I got this plant specifically for bees whom love it. It arrived very well packaged (in fact GrowJoy could teach other companies how to properly ship plants) and growing. It took well to its transplanting and at the moment is quite green and thriving.

From Mary | June 20, 2018

Fun to grow!

I enjoyed watching the Black Adder plant grow. It grows really fast and the plant is interesting before it even blooms. It smells fantastic and the purple isn't as dark as I expected... More of a Lilac color

From jordan | July 11, 2015

Love it!

My Black Adder arrived healthy and happy. I planted it in the center of a new bed and its flourishing! It's my favorite plant to watch grow. Without blooms it's already making a strong statement! I just ordered two more.

From jordan | May 27, 2015

Beautiful, healthy Agastache plants!

I first saw these plants at a place to ride trolleys and knew I had to have them. I found them online at GrowJoy and ordered 3. They came well packaged and fast, a good size and healthy. Beautiful! I planted them quickly and they are doing great. I highly recommend this garden center. Great people, great products!

From Donna | August 22, 2013


Very happy with arrival time and condition.

From Edward | August 08, 2013

Great Agastache Plant!

Beautifully packed, fresh and my Black Adder arrived in great condition. Fast shipping.

From Linda | June 06, 2013

Black Adder Agastache Plant

I love this plant since it is one (maybe only) Agastache that doesn't reseed and become a pest. It is tall and a beautiful color. I was trouble finding it anywhere and delighted to see that GrowJoy offered it. I ordered 3 and all arrived healthy and good size to grow out.

From Jessica | May 23, 2013

Butterflies Love This Agastache!

I have a couple plants of 'Black Adder' in my flower bed in the front yard and love to see Butterflies sipping nectar from the beautiful and colorful flowers! I ordered two so that the Butterflies and myself will have plenty of flowers to enjoy! Love this Agastache!

From anonymous | May 09, 2013

Happy Customer

Black Adder Agastache Plants arrived in excellent condition (as fresh as if I had bought them locally). Packing was perfect no damage to boxes or plants. Plants are vigorous, good size, and healthy. I was able to plant them right away; they are doing incredibly well. I will definitely buy from GrowJoy in the future!

From Katherine | May 09, 2013

Healthy and lovely!

I originally ordered the Raspberry Agastache but, I received a friendly call from GrowJoy letting me know it was out of stock. I opted to purchase the Black Adder instead and I'm very happy with this little plant. My order arrived extremely fast and the plant came healthy with rich, moist soil. I can't imagine what the blooms will smell like but, the leaves have a wonderful fragrance! Somewhat like a sweet licorice as the description states. The leaves themselves are attractive to look at and have soft translucent hairs. I've already planted it and I look forward to seeing this sweet plant grow and bloom.

From anonymous | November 22, 2012