Plant Profile: Agastache 'Black Adder'

The 'Black Adder' Giant Hyssop is a hybrid variety resulting from the crossbreeding of A. rugosa and A. foeniculum, both members of the mint family. This plant typically reaches heights and widths of 2 to 3 feet, featuring fragrant foliage and an extended flowering period. Its dense spikes of reddish-purple blooms provide a striking vertical element in the garden while attracting bees, butterflies, and hummingbirds. To encourage continued blooming, it is advisable to deadhead the flowers.

For optimal growth, these plants require good drainage, as they cannot withstand winter conditions in wet clay soils. Once established, they exhibit drought tolerance. Ideal planting locations include full sun to light shade, making them suitable for perennial borders, butterfly and pollinator gardens, rock gardens, or containers.

Potential issues include crown rot in overly wet soils, but there are no significant concerns regarding diseases or pests.

For further details on Agastache, additional resources are available.