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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
description:
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.

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

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

usage:
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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