Hyssop

Agastache 'Black Adder'

Hyssop - Agastache  'Black Adder'

Common Name: Hyssop
Genus: Agastache
Cultivar: 'Black Adder'

Category: Perennials
Growth Rate: Average
Features: Has fragrant flowers/foliage, Good for wildlife, Long flowering period

Hardiness: HardyHeight: 0.90 m (90 cm)
Sun/Shade: Full sunSpread: 0.40 m (40 cm)

Foliage Type: DeciduousFlower Colour: Purple
Foliage Colour: GreenFlowering Period: July to October

Soil Type: Normal/Loam or Sandy/Light or Chalky/Alkaline
Soil Moisture: Dry, well drained

Hyssops are great for adding height to a border with whorls of long-lasting tiny flowers arranged like a bottlebrush and pointed aromatic fresh green leaves that are attractive to butterflies. They are short-lived though and may need replacing every few years especially after a cold or wet winter. 'Black Adder' has smoky violet flowers on long spires from July to October. Try it as part of a Mediterranean scheme or in a sunny well-drained border among ornamental grasses.

  • Garden care: Don't cut back the faded flower-stems until early spring as they provide interest in the winter months. Lift and divide congested colonies in spring.



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