• Agastache Black Adder in the garden
  • Butterflies enjoying the Flowers of Agastache  Black Adder
  • Agastache black adder flowers
  • Agastache Black Adder in the wild garden

Images Depict Mature Plants

Agastache Black Adder

Agastache x. 'Black Adder'

Agastache Black Adder is a reliably hardy perennial that has licorice scented foliage and is a honey bee, butterfly and hummingbird magnet! Extremely deer-proof even in areas of high deer populations.

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Agastache Black Adder Plants for Sale Online

Agastache Black Adder produces numerous bottle-brush-shaped flowers of vivid Violet-blue from mid-summer to frost on a compact, rounded plant. It has been reliably hardy for us in the ground winter after winter.

Black Adder hyssop is best planted in the middle or the back of the mixed perennial border. The hyssop scented foliage is dark green and, when crushed, fills the air with the scent of Black licorice. The flowers are attractive to butterflies and hummingbirds and are excellent for cutting and adding to seasonal flower arrangements. Pinch the growth tips in June to keep plants compact and promote more flowers.

Agastache Black Adder is a sterile hybrid that does not produce viable seeds. Being sterile means all the energy goes into making more flowers rather than seeds, allowing this variety of Anise Hyssop to flower over a more extended period. If self-seeding is a concern for your garden, then this is the Hyssop plant for you.

This worry-free plant is highly deer-resistant and can be planted in areas with high deer pressure. It can also be planted as a protective barrier near plants that deer favor. 

Agastache Black Adder is a hybrid of Agastache foeniculum and Agastache rugosa and is often called Giant Hyssop.


Growzone: 6-9 Agastache Black Adder Hardiness Zone 6-9
Hardiness Zone: 6-9
Mature Height: 2 to 3 Feet
Mature Width: 2 to 3 Feet
Sunlight: Full sun
Habit: Upright, clump forming
Flower Color: Bright vivid blue
Flowering Season: Mid-June through frost
Foliage: Green
Soil Condition: Prefers dry, average to sandy soil, wont tolerate wet soil in winter
Water Requirements: Water well until established
Uses: Extremely attractive when used as a focal point in the mixed border, mass planting. Attracts pollinators and hummingbirds.

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