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botanical name:
Agastache 'Black Adder'
Agastache 'Black Adder' © Deeproot Plant Base
common name:  Giant Hyssop
family:  Lamiaceae
characteristics: perennial, scented/aromatic
height: 0.60m
width: 0.60m
growth rate: medium
growth habit: clump
leaf colour: green
flower colour: violet
main season: Summer
edible symbol edible
aspect: full sun, part shade
conditions: dry soil, moist soil, sandy soil
preferred soil pH: neutral
minimum temp: -20°C
USDA zone: 6 to 9
Long spikes of violet-blue flowers with dark purple calyces, in mid to late summer. Good aromatic bushy green foliage, often with bronze tinting. Fairly short growing.

Average, moist to dry, well-drained soil in full sun to light part shade.

By division or by cuttings taken before flowering.
This variety is sterile and should not set seed.

Borders, herb gardens
Attractive to insects.
The aromatic leaves can be used to flavour cold drinks.

other notes:
Hybrid of A. foeniculum x A. rugosa
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