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Black Adder Agastache Plant (Giant Hyssop)
Black Adder Agastache Plant (Giant Hyssop)

Black Adder Agastache Plant (Giant Hyssop)

Price: 16.99
Each Quart-sized Pot contains 1 plant
Full Sun to Part Sun (3+ hours)Moist to Dry30-inches tall x 36-inches wide
Plant Features

Black Adder Agastache Plants produce spikes of smokey red-violet blossoms that flower all summer and into fall. They are a pollinators dream! It offers a long flowering season, heat and drought tolerance, and scented foliage. Removing the spent flowers keeps it blooming longer. Adds eye-popping color and texture. Giant Hyssop grow well in a wide range of well-drained soils, though they are short lived on damp clay. 

Plant Needs
Preferred Sunlight: Full Sun to Part Sun (3+ hours)
Preferred Soil Moisture: Moist to Dry, Well-drained
Fertilizer Needs: When transplanted and then once every Spring
Survives Winter in Zones: 6, 7, 8, 9
Plant Characteristics
Habit: Upright
Mature Plant Size: 30-inches tall x 36-inches wide
Flower Color: Blue, Purple
Bloom Time: July, August, September
Attracts: Bees, Butterflies, Hummingbirds
Critter Resistance : Deer, Rabbit
Product Reviews
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"Black Adder Agastache Plant (Hummingbird Mint)"

Nancy G on 7/17/2019 1:47:23 PM

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Comment: 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.

"Black Adder Agastache Plant"

George G on 5/11/2019 12:49:50 PM

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Comment: 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.

"healthy plants"

susan J on 9/7/2018 11:27:37 AM

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

"Agastache"

Mary W on 6/20/2018 10:35:05 AM

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Comment: 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.

"Fun to grow!"

jordan t. on 7/11/2015 6:51:05 PM

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Comment: 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

"Love it!"

jordan t on 5/27/2015 11:05:07 AM

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Comment: 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.

"Beautiful, healthy Agastache plants!"

Donna H on 8/22/2013 4:37:16 PM

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Comment: 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!

"Hyssop"

Edward C on 8/8/2013 10:35:15 AM

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Comment: Very happy with arrival time and condition.

"Great Agastache Plant!"

Linda M on 6/6/2013 9:23:42 PM

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

"Black Adder Agastache Plant"

Jessica S. on 5/23/2013 8:59:08 AM

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Comment: 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.