Giant Hyssop 'Black Adder'
- Reserve now for spring shipping
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Free shipping on all orders over $120
Limited Time: Free shipping on all orders over $75
$ 34.99
In Stock
2025 Spring Shipping Schedule:
| Zones | First Shipping Date |
| 7+ | March 3, 2025 |
| 5-6 | April 7, 2025 |
| 3-4 | May 5, 2025 |
Giant Hyssop 'Black Adder' adding color and texture to your garden all summer long with tall spikes of purple fragrant flowers that hummingbirds & pollinators will love! These purple flowers sit atop darker green wonderful smelling foliage that have the scent of anise when rubbed between your fingers. Perfect addition to herb, butterfly, wildflower gardens that will give you color when most things are done blooming
Grows in upright clumps that reach 2-3 ft tall and around 2 ft wide.
Has a long bloom time from summer into fall.
Once roots are established this perennial is drought tolerant and low maintenance. Grow in full sun with well draining soil.
Deer Resistant
Deadhead spent blooms to make way for new growth and continual blooming
Shipping Methods
Orders will be shipped via FedEx Home Delivery.
Orders are generally in route for 2-5 business days (depending on where you live).
We are sticklers about packaging and shipping your order in a way that guarantees healthy plants upon arrival. If plants are damaged on arrival, just let us know and we'll send you new ones or offer a full refund.
All of our plants are container grown and shipped with the soil and roots fully intact. We DO NOT ship your plants bare-root. Being shipped as a containered plant greatly reduces the risk of the plant not surviving the transit to your home.
Shipping Rates
| Order Total | Shipping Cost |
| $0.00 - $119.99 | $14.95 |
| $120+ | FREE |
When will my order ship?
2025 Spring Shipping Schedule:
| Zones | First Shipping Date |
| 7+ | March 3, 2025 |
| 5-6 | April 7, 2025 |
| 3-4 | May 5, 2025 |
How will my order be shipped?
Your order will be shipped FedEx Home Delivery. Once shipped, your order should arrive in 2-5 business days.
How much does shipping cost?
All orders $120 or more ship free. Orders under $120 ship for a flat rate of $14.95.
Do you guarantee your plants?
Yes. If, in the rare case your plants are damaged upon arrival, just contact us within 7 days and a full refund or exchange will be issued for those plants.
Will this plant grow where I live?
The hardiness zones that each plant will grow in are listed in the plant details section. Please make sure that the plants are rated for the zone you live in. If you don't know what zone you are in, please check the zone map and zip code lookup tool above to find out.
If I order now, can I delay shipping for sometime in the future?
Sure. After placing your order, just send us an email with your order number and the date you would like your order delivered.
We promise to only send you healthy, well rooted plants. If, in the rare case your plants are damaged upon arrival, or you are not completely satisfied, contact us at hello@thegreenhousepnw.com within 30 days of receiving your order, and we’ll take care of it.
If your plant(s) were damaged on arrival, we will send out replacements to you immediately at no extra charge to you.
If that plant is no longer in stock, or you prefer to not receive a replacement, we will issue full refund for any damaged plants.
In some cases, we may simply request a photo of the damaged plant to verify condition of plant before we process replacement or refund.
If you have any other questions about our refund/replacement policy, please feel free to email us at hello@thegreenhousepnw.com
This Plant's Growing Zones: 6 - 9
What's my zone?
Botanical Name:
Agastache 'Black Adder'
Plant Type:
Perennial
Light Requirements:
Full Sun
Mature Height:
2-3 ft.
Mature Spread:
2 ft.