Sign up for News & Availability Emails
Site Search:
Agastache 'Black Adder' (hyssop)

Click here to download technical information for growers:

Technical sheet - Agastache

Agastache 'Black Adder'

hyssop

The second fantastic Agastache given to us by Coen Jansen, 'Black Adder' boasts numerous bottlebrush flowers of vivid blue from mid summer to frost on a compact, rounded plant. It has been hardy for us in the ground and in containers and has proven to be a reliable production plant as well. An early pinch keeps it more compact in pots.

SIZE
Agastache 'Black Adder' - 72 per flat Availability
Add to My North Creek Nurseries Wish List

Height

2-3 Feet

Spread

2-3 Feet

Spacing

12-15 Inches

Bloom Color

Violet

USDA Hardiness Zone 6-10

Agastache 'Black Adder' Growing and Maintenance Tips

Grow in full sun and average to dry soils with average to good drainage. Definitely more tolerant of winter wetness than its pink cousins, but it may still succumb to wet clay soils in the winter.

Good Substitutions

Hyssop Agastache 'Golden Jubilee'
anise hyssop Agastache foeniculum
hyssop Agastache 'Blue Boa'
hyssop Agastache 'Purple Haze'

Key Characteristics & Attributes

Full Sun
Full Sun
Hummingbird-friendly
Hummingbird-friendly
Songbird-friendly
Songbird-friendly
Pollinator-friendly
Pollinator-friendly
Deer Resistant
Deer Resistant
Fragrant
Fragrant
Cut Flower
Cut Flower
Drought Tolerant
Drought Tolerant
Summer
Summer

Additional Information

Soil Moisture Needs
Dry
Average
Green Infrastructure
Green Roof
Plug Type
Horticultural Plug
Attributes
Edible
Season of Interest (Flowering)
Late Summer
Propagation Type
Vegetative