Alphabetical Plant Listing

Agastache 'Black Adder' (Giant Hyssop)

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


Hardy and reliable, Agastache 'Black Adder' (Giant Hyssop) is a charming herbaceous perennial boasting bottle-brush, terminal spikes, 6-8 in. long (15-20 cm), packed with fragrant, tubular, two-lipped red-violet flowers emerging from dark buds. Blooming from mid-summer to fall, they provide a remarkably long floral display and add color as well as a lovely spiky texture to the 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 and borders, cottage gardens, gravel gardens, butterfly gardens, or Mediterranean gardens over a very long season.
  • Ideal to add color to the late-season garden when many other plants are fading.
  • Creates a stunning effect when mixed with other perennials or planted en masse.
  • 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.
  • 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.
  • Trim back stems in late autumn to reduce windrock. Prune flowered stems back in spring.
  • Root semi-ripe cuttings in late summer and overwinter under cover; propagate by division in spring. This cultivar is sterile.

 

Not sure which Agastache - Hyssops to pick?
Compare All Agastache - Hyssops

Buy Agastache 'Black Adder' (Giant Hyssop)

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 Well-Drained
Characteristics Dried Arrangements, Cut Flowers, Fragrant, Showy
Tolerance Deer, Drought, Rabbit
Attracts Butterflies, Hummingbirds
Garden Uses Banks and Slopes, Beds and Borders
Garden Styles Gravel and Rock Garden, Informal and Cottage, Mediterranean Garden

Buy Plants

Great Plant Combination Ideas with Agastache - Hyssops

Guides with Agastache - Hyssops


©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 Well-Drained
Characteristics Dried Arrangements, Cut Flowers, Fragrant, Showy
Tolerance Deer, Drought, Rabbit
Attracts Butterflies, Hummingbirds
Garden Uses Banks and Slopes, Beds and Borders
Garden Styles Gravel and Rock Garden, Informal and Cottage, Mediterranean Garden

Great Plant Combination Ideas with Agastache - Hyssops

Guides with Agastache - Hyssops

Plant Calculator

How many Agastache 'Black Adder' (Giant Hyssop) do I need for my garden?

%
ft
ft

Your Shopping List

Plant Quantity
Agastache 'Black Adder' (Giant Hyssop)

Find your Hardiness Zone

Find your Climate Zone

Find your Heat Zone

Join Gardenia.net

Create a membership account to save your garden designs and to view them on any device.

Becoming a contributing member of Gardenia is easy and can be done in just a few minutes. If you provide us with your name, email address and the payment of a modest $25 annual membership fee, you will become a full member, enabling you to design and save up to 25 of your garden design ideas.

Join now and start creating your dream garden!

Create a New Collection

Optional. For your reference.


Move Selected Plants to a Different Collection


Delete Collection

This field is required.

Rename Collection

This field is required.