This product does not ship to: Idaho
Availability : In Stock

Black Adder Giant Hyssop

Availability : Pre-Order
Availability : In Stock
$35.49
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This product does not ship to: Idaho
  • Full Sun (At Least 6 Hours Of Direct Sunlight)
  • Mature Height 2 - 3 Feet
  • Mature Spread 2 - 3 Feet
  • Growing Zones 6 - 9

There is so much going for the Black Adder Giant Hyssop that it is hard to know where to start. Also known as Agastache 'Black Adder', this giant hyssop produces tall red-violet flower spikes from June until the fall. Furthermore, aromatic foliage that smells of aniseed accompanies the almost-black buds before they bloom. Black Adder grows to around 2 to 3 feet tall and provides interest for months. 

A serious pollinator magnet, the Black Adder Giant Hyssop is perfect for drawing in wildlife. It is deer resistant and suited to growing in zones 6 to 9. This perennial is perfect for a variety of garden uses, including dry gardens, wildlife areas, cottage schemes and mixed borders. Black Adder is drought and heat tolerant once established. 

Black Adder Giant Hyssop Care

The Black Adder Giant Hyssop requires full sun to thrive. It can cope with most soil types and pH levels as long as the drainage is good. Water for the first season to help it establish. Thereafter, Black Adder can tolerate dry spells and does not need much supplemental water. Fertilization is not generally required. However, to give it a boost, you can mulch it in the spring with a layer of organic matter. 

Cut back spent flower stems to just above ground level in early spring. As winter approaches, you can shorten the stems to prevent potential wind damage. 

Black Adder Giant Hyssop Spacing

Over time, the Black Adder Giant Hyssop can grow to 2 to 3 feet tall by 1 to 2 feet wide. A spacing of 18 to 24 inches is suitable when planting out in a group.

Black Adder Giant Hyssop Information

USDA Hardiness Zones: 6 - 9
Plant Type:
Light Exposure: Full Sun (At Least 6 Hours Of Direct Sunlight)
Mature Height: 2 - 3 Feet
Mature Spread: 2 - 3 Feet
Spacing: 18 - 24 Inches
Habit: Clumping, Upright
Flower Color(s): Purple, Red
Flower Description: Purple and Red Shades
Bloom Period: Summer
Foliage Type: Herbaceous
Foliage Color(s): Blue, Green
Foliage Description: Blue and Green Shades
Seasonal Interest: Summer Flowering
Watering: Average
Resists: Deer
Tolerates: N/A
Attracts: N/A
Container Role:
Uses: Borders, Sensory Gardens, Wildlife Gardens
Features: Cut Flowers, Fragrant
Brand:
Common Name: Black Adder Giant Hyssop
Other Name(s): Hyssop, Hummingbird Mint, Anise Hyssop
Scientific Name: Agastache 'Black Adder'
SKU:
1231020693-pc

Container Sizes

Please Note: The pictures below are to give a general representation of the different container sizes. The actual size/ages of plants are estimates and will vary based on type of plant, time of year, last pruning & many other factors.

Quart Pot

Quart Pot

Also Known As:
Quart

Plant Age:
~ 6 months - 1 year

Plant Size:
~ 4"-8"

Pot Size:
~ 4.75"H x 4.5"W

Volume:
1.50 quarts

2.5 Quart

2.5 Quart

Also Known As:
2.5 Quart Pot

Plant Age:
~ 1 - 2 years old

Plant Size:
~ 8"-12"

Pot Size:
~ 6.5"H x 6.5"W

Volume:
2.20-2.30 quarts

#1 Pot

#1 Pot

Also Known As:
#1 Container
1 Gallon

Plant Age:
~ 1 - 2 years old

Plant Size:
~ 10"-14"

Pot Size:
~ 7"H x 7.75"W

Volume:
2.26-3.73 quarts

#2 Pot

#2 Pot

Also Known As:
#2 Container
2 Gallon

Plant Age:
~ 1.5 - 3 years old

Plant Size:
~ 12"-18"

Pot Size:
~ 9.5"H x 9.5"W

Volume:
1.19-1.76 gallons

#3 Pot

#3 Pot

Also Known As:
#3 Container
3 Gallon

Plant Age:
~ 2 - 4 years old

Plant Size:
~ 12"-30"

Pot Size:
~9.5"H x 11"W

Volume:
2.32-2.76 gallons

#5 Pot

#5 Pot

Also Known As:
#5 Container
5 Gallon

Plant Age:
~3-4 years old

Plant Size:
~ 20" - 60"

Pot Size:
~11" H x 10 1/2” W

Volume:
3.5 - 4 gallons

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We want your plants to arrive in great condition! If you notice any issues upon delivery, contact us within 3 days.

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Plant Shipping

Pre-Ordered Plants

Pre-ordered plants are scheduled to ship in Spring 2025. We carefully plan our shipping dates based on your USDA Plant Hardiness Zone to ensure optimal planting conditions upon arrival. Want it sooner/later? Reach out, and we'll try our best to accommodate.

Estimated Spring Shipping Schedule

Estimated ship week for pre-ordered plants will ship based on growing zones as shown below.

Growing Zone Estimated Ship Week
Zone 10March 24th
Zone 9March 31st
Zone 8April 7th
Zone 7April 14th
Zone 6bApril 21st
Zone 6aApril 28th
Zone 5bMay 5th
Zone 5aMay 12th
Zone 4May 19th
Zone 3May 26th

Note: These are only estimated ship dates. Plants may ship out later depending on weather & growing conditions of the plant.

Note: Only plants indicated as pre-order will ship as shown above. All other plants and hard goods will ship as normal.

Plants Shipping Now

Plants that are currently in stock typically ship within 2-7 business days after your order is placed.