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Black Adder Hyssop

Agastache 'Black Adder'

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Black Adder Hyssop (Agastache 'Black Adder') at Ashcombe Farm & Greenhouses

Agastache 'Black Adder' flowers

Agastache 'Black Adder' flowers

(Photo courtesy of NetPS Plant Finder)

Plant Height:  3 feet

Flower Height:  4 feet

Spread:  24 inches

Sunlight:  full sun 

Hardiness Zone:  5b

Other Names:  Anise Hyssop, Licorice Mint, Hummingbird Mint

Description:

Airy dark purple spikes of smokey lavender flowers complement coarser textured perennials in the garden; attracts hummingbirds and other pollinators; aromatic, licorice scented green foliage; pinch in June to keep plants compact

Ornamental Features

Black Adder Hyssop features airy spikes of lightly-scented lavender tubular flowers with deep purple calyces rising above the foliage from mid summer to mid fall. The flowers are excellent for cutting. Its attractive fragrant pointy leaves remain dark green in color throughout the season. The fruit is not ornamentally significant.

Landscape Attributes

Black Adder Hyssop is an open herbaceous perennial with an upright spreading habit of growth. Its relatively fine texture sets it apart from other garden plants with less refined foliage.

This is a relatively low maintenance plant, and is best cleaned up in early spring before it resumes active growth for the season. It is a good choice for attracting bees, butterflies and hummingbirds to your yard, but is not particularly attractive to deer who tend to leave it alone in favor of tastier treats. It has no significant negative characteristics.

Black Adder Hyssop is recommended for the following landscape applications;

  • Mass Planting
  • General Garden Use
  • Naturalizing And Woodland Gardens
  • Herb Gardens
  • Container Planting

Planting & Growing

Black Adder Hyssop will grow to be about 3 feet tall at maturity extending to 4 feet tall with the flowers, with a spread of 24 inches. It grows at a fast rate, and under ideal conditions can be expected to live for approximately 6 years.

This plant should only be grown in full sunlight. It prefers dry to average moisture levels with very well-drained soil, and will often die in standing water. It is considered to be drought-tolerant, and thus makes an ideal choice for a low-water garden or xeriscape application. It is not particular as to soil type, but has a definite preference for alkaline soils, and is able to handle environmental salt. It is somewhat tolerant of urban pollution. This particular variety is an interspecific hybrid. It can be propagated by division; however, as a cultivated variety, be aware that it may be subject to certain restrictions or prohibitions on propagation.

Black Adder Hyssop is a fine choice for the garden, but it is also a good selection for planting in outdoor pots and containers. With its upright habit of growth, it is best suited for use as a 'thriller' in the 'spiller-thriller-filler' container combination; plant it near the center of the pot, surrounded by smaller plants and those that spill over the edges. Note that when growing plants in outdoor containers and baskets, they may require more frequent waterings than they would in the yard or garden.

 
 
Hardiness Zone Plant Height Minimum Sunlight Soil pH Preference
Characteristics
Massing  Garden  Naturalizing  Herb  Container 
Applications
Flowers  Foliage Color  Texture  Attracts Wildlife 
Ornamental Features