Alphabetical Plant Listing

Agastache 'Black Adder' (Giant Hyssop)

Giant Hyssop 'Black Adder', Hyssop 'Black Adder', Anise Hyssop 'Black Adder', Hummingbird Mint 'Black Adder'


Agastache 'Black Adder' enjoys a remarkably long floral display, from midsummer to fall, of fragrant, tubular, two-lipped red-violet flowers emerging from dense, dark buds and held in bottle-brush, terminal spikes about 6-8 inch long (15-20 cm). Eye-popping, this Agastache will add color and a lovely spiky texture to your garden.

  • Forms upright clumps up to 2-3 feet tall (60-90 cm) and 18-24 in. wide (45-60 cm), with aromatic, blue-green leaves which exude an anise scent when crushed.
  • Provides a bold visual impact in beds, borders, wildflower gardens, herb gardens, butterfly gardens or prairie gardens over a very long season.
  • Ideal to add color in the late season garden when many other plants are fading.
  • Creates a stunning effect when mixed with other perennials or planted en masse. Perfect for prairie plantings where it will thrive without maintenance.
  • Attracts streams of hummingbirds, butterflies and other beneficial pollinators.
  • Easily grown in full sun, in average, dry to medium moisture, well-drained soils. Good drainage is particularly important. Prefers alkaline soils, but will tolerate poor, acid conditions.
  • Drought, dry soil and heat tolerant once established.
  • Generally disease and pest free (might occasionally be subject to powdery mildew) and resistant to deer and rabbits.
  • Deadhead spent flowers to promote additional bloom. 

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Requirements

Hardiness 6 – 9
Heat Zones 5 – 12
Climate Zones 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Perennials
Plant Family Agastache - Hyssops
Exposure Full Sun
Season of Interest Summer (Mid,Late)
Fall
Height 2' – 3' (60cm – 90cm)
Spread 1' – 2' (30cm – 60cm)
Spacing 18" – 24" (45cm – 60cm)
Water Needs Average
Maintenance Low
Soil Type Chalk, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Dried Arrangements, Cut Flowers, Fragrant, Showy
Tolerance Deer, Drought, Rabbit
Attracts Butterflies, Hummingbirds
Garden Uses Beds and Borders, Edging, Ground Covers
Garden Styles City and Courtyard, Gravel and Rock Garden, Informal and Cottage, Prairie and Meadow

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©Mark Bolton Photography, ©Graham Rice / Garden Photos .com

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 6 – 9
Heat Zones 5 – 12
Climate Zones 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Perennials
Plant Family Agastache - Hyssops
Exposure Full Sun
Season of Interest Summer (Mid,Late)
Fall
Height 2' – 3' (60cm – 90cm)
Spread 1' – 2' (30cm – 60cm)
Spacing 18" – 24" (45cm – 60cm)
Water Needs Average
Maintenance Low
Soil Type Chalk, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Dried Arrangements, Cut Flowers, Fragrant, Showy
Tolerance Deer, Drought, Rabbit
Attracts Butterflies, Hummingbirds
Garden Uses Beds and Borders, Edging, Ground Covers
Garden Styles City and Courtyard, Gravel and Rock Garden, Informal and Cottage, Prairie and Meadow

Great Plant Combination Ideas with Agastache - Hyssops

Guides with Agastache - Hyssops

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