Agastache ‘Black Adder’ – Giant or anise hyssop


Forms long spikes of dark purple flowers.


SKU GCC10011 Category


A very attractive and easy to grow plant. Leaves have a delicious, liquorice-like smell. From mid-summer to frost, plants have spires of dark purple flowers.

Anise or giant hyssops are among the most bee-attracting plants in North America.

Historically, mass plantings of one species, anise hyssop, were established in parts of the Midwest and Canada specifically as a honey plant. Nineteenth-century beekeeper accounts claimed that a single acre could provide ample forage for 100 colonies of bees, and that bees preferred giant hyssop even to sweetclover.” – 100 Plants to Feed the Bees

Black Adder is a cultivar hybridized from Agastache foeniculum (native to the Northeast US) and Agastache rugosum.

Height: 2-3 ft.

Sun: Sun

Water: Medium to dry

Bloom color: Dark purple

Bloom time: July, August, September

Additional information

quart, 2-gallon, gallon

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