Skip to content

Black Adder Giant Hyssop

Agastache X 'Black Adder'

Design with this plant

Overview

Agastache x 'Black Adder', commonly known as Black Adder Giant Hyssop, is a robust perennial attracting pollinators with its dense spikes of indigo-blue flowers. Mature at about 2 to 3 feet tall and 1.5 to 2.5 feet wide, this sun-loving plant thrives in well-drained soil. Its aromatic, anise-scented foliage offers a long blooming period from midsummer to fall, providing enduring vibrancy and fragrance to any garden design.

Sun Full, HalfWater MediumZones 5–9Climate Arid, Subtropical
Black Adder Giant Hyssop (Agastache X 'Black Adder') — commonly known as Black Adder Giant Hyssop

Culture

Sun
Full, Half
Water
Medium
USDA zones
5–9

Shape & size

Classification

Family
Lamiaceae
Climate
Arid, Subtropical

See full data, regional cultivation notes, full-resolution photos, and design tools. Build a client presentation around this plant.

Start your 14-day trial

Photos

Black Adder Giant Hyssop (Agastache X 'Black Adder') — commonly known as Black Adder Giant Hyssop

Related plants

White Nancy Dead Nettle (Lamium Maculatum 'White Nancy') — Lamium maculatum 'White Nancy' is a shade-loving perennial ground cover

White Nancy Dead Nettle

Lamium Maculatum 'White Nancy'

Deep Shade · Zones 3–10

Hidcote English Lavender (Lavandula angustifolia 'Hidcote') — The Hidcote English Lavender (Lavandula angustifolia 'Hidcote') is a compact evergreen shrub

Hidcote English Lavender

Lavandula angustifolia 'Hidcote'

Full · Zones 9–11

Seer's Sage (Salvia divinorum) — Seer's Sage (Salvia divinorum) is a psychoactive perennial

Seer's Sage

Salvia divinorum

Shade · Zones 7–9

Purple Haze Hummingbird Mint (Agastache 'Purple Haze') — commonly known as Purple Haze Hummingbird Mint

Purple Haze Hummingbird Mint

Agastache 'Purple Haze'

Full · Zones 5–10

Sticky Jerusalem Sage (Phlomis russeliana) — commonly known as Sticky Jerusalem Sage

Sticky Jerusalem Sage

Phlomis russeliana

Full · Zones 4–10

Swedish Ivy (Plectranthus verticillatus) — The Swedish Begonia, Plectranthus australis, is a versatile, evergreen perennial

Swedish Ivy

Plectranthus verticillatus

Half · Zones 10–11