Close up of agastache x black adder (giant hyssop) growing in pots.

Agastache x 'Black Adder' (Giant Hyssop)

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'Black Adder' is hybrid cultivar of two Agastache species, A. foeniculum and A. rugosa, and as a result, produces the best of both worlds in the home garden: upright, attractive lavender flowers emerge from dark purple to black buds, and are produced from mid summer until the first frosts of fall, attracting butterflies, hummingbirds, and other pollinators.

This easy to grow giant hyssop/anise hyssop hybrid typically reaches two to three feet tall, though flower spikes can bring the total height closer to four feet. 'Black Adder' prefers locations with full sun and well drained soil with average moisture, but is drought and dry soil tolerant once established. Like all Agastache, plant tissues are fragrant when bruised, making them resistant to both rabbit and deer browsing.

Mature Plant Height: Medium: 30-48"
Deciduous
Sun (6+ hours)
Soil Moisture: Well-drained and Medium to Dry
Soil Type: Wide Tolerance
Bloom Time: Summer and Fall
Flower Color: Purple
Foliage color: Green
Features: Attracts Butterflies, Attracts Hummingbirds, Attracts Pollinators, Fall Color, and Fragrant
Tolerances: Drought Tolerant, Deer Tolerant, and Rabbit Tolerant
Garden Type: Pollinator Garden, Meadow, Small Space, and Rock Garden

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