Agastache x 'Black Adder' ~ Black Adder Giant Hyssop
Agastache x 'Black Adder' ~ Black Adder Giant Hyssop
Agastache x 'Black Adder' ~ Black Adder Giant Hyssop

Black Adder Giant Hyssop

Agastache x 'Black Adder'

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Black Adder Giant Hyssop, also known as Agastache 'Black Adder', is a perennial plant that is known for its striking, dark blue-purple flowers and its attractiveness to pollinators.

This plant typically grows to a height of 2-3 feet with a similar spread. It prefers full sun and is adaptable to a variety of soil conditions, but it thrives best in well-drained, fertile soils. Black Adder Giant Hyssop is also drought-tolerant once established, making it a great choice for xeriscaping or low-water gardens.

The flowers of Black Adder Giant Hyssop are dark blue-purple and appear on tall spikes from midsummer to early fall. The leaves are aromatic and have a minty fragrance when crushed.

Type: 

Perennial

Orgins:

N. America

Height: 

2' - 3'

Spread: 

1.5' - 3'

Spacing: 

1.5'

USDA Hardiness Zone: 

5 - 9

Culture: 

Full SunPart Sun

Bloom Color: 

Purple

Season of Interest: 

Summer, Fall

MAINTENANCE NEEDS: Low maintenance.  Crown and root rot may occur in poorly drained soils.  No serious pests or disease issues but watch for powdery mildew, wilt, and rust.  

LANDSCAPE USES:  Accents or Group Plantings, BordersWoodland GardensNaturalized Areas, Foundational Plantings, and Containers.

COMPANION PLANTS:  ConeflowerDaylily,  Russian Sage

IMAGES: Photo by CAJC: in the PNW, Hyssop, (2) Photo by David J. Stang,  Agastache Black Adder 4zzCC BY-SA 4.0

*As plants have ranges in appearance they may not appear as the images shown.

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