Agastache foeniculum

Blue Giant Hyssop

 
Agastache foeniculum, Blue Giant Hyssop View Larger Image

Blue Giant Hyssop (Agastache foeniculum) is an exceptionally cold-hardy Hyssop that blooms for many months with smoky-blue flowers held above attractive, aromatic foliage. It is native to the Mid-west.

Learn More…
$10.99
per plant - 5" deep pot
Zones 4 - 8
Advantages
Deer Resistant
Deer Resistant
Attract Butterflies
Attract Butterflies
Rabbit Resistant
Rabbit Resistant
Fragrant Flower / Foliage
Extended Bloom Time (more than 4 weeks)
Light Requirements
Full Sun
Full Sun
Annual Rainfall
Average
Drought Resistant / Waterwise
10 to 20", 20 to 30", 30 to 40"
Bloom Time Mid to late summer
Shipping Buy now and we'll ship your order during the ideal planting time for your region. Learn More…
Size Plant - 5" deep pot
SKU HBLVN51

Details

30-36" tall x 15-18" wide. Agastache foeniculum (Blue Giant Hyssop), a native to the northern tier states and Canada, this exceptionally cold hardy Hyssop blooms for many months with smoky-blue flowers held above attractive, aromatic foliage. An outstanding perennial for attracting bees and butterflies with its nectar-rich flowers, Agastache foenicuum is highly recommended for gardeners in the moister eastern half of the country, where more xeric Hyssops (Hummingbird mints) like A. rupestris and A. cana will struggle.
SKU HBLVN51
Common Name Blue Giant Hyssop
Botanical Name Agastache foeniculum
Zones 4, 5, 6, 7, 8
Light Requirements Full Sun
Flower Color Blue
Mature Height 30-36" tall
Mature Spread 15-18" wide
Bloom Time Mid to late summer
Ships As Potted Plant
Native Yes
Planting Time Spring / Summer
Soil Type Average Soil
Soil Moisture Average, Drought Resistant / Waterwise
Amount of Rain 10 to 20", 20 to 30", 30 to 40"
Advantages Deer Resistant, Attract Butterflies, Rabbit Resistant, Fragrant Flower / Foliage, Extended Bloom Time (more than 4 weeks)
Ideal Region Anywhere In The US
Neonicotinoid-Free Yes - Learn More
Ships to Hawaii, Alaska & Canada No

Planting Guides

Tips for growing Agastache

Agastache are sun loving plants with aromatic foliage and flowers. They bloom from mid-summer into early fall and are resistant to rabbits and deer.

Agastache need lean, well-drained soils, prefer gravel mulches, and appreciate deep but infrequent watering after their second growing season

  1. Provide a fast draining soil that's naturally low in fertility, Don't plant into clay soils.
  2. Plant in full hot sun.
  3. Just a few handfuls of compost in the planting hole is enough. Don't plant into a rich, highly amended soil..
  4. Fertilize the Agastache just once in fall with Yum Yum Mix and Planters II.
  5. New transplants need regular irrigation their first growing season to establish themselves. Watering can be reduced greatly during the second growing season when the plants have matured.

To improve winter-hardiness, and encourage re-seeding, leave the stems intact over the winter. In mid-spring, remove old stems just above the new foliage, about 4 or 5 inches above ground level.

If your conditions don't lend themselves to growing Agastache in your garden, they do well planted in containers.

More in-depth guidance for growing Agastache: Agastache Growing Tips, Agastache: Super-Stars of the Perennial World Part 1, and Agastache: Super-Stars of the Perennial World Part II.


View more Planting Guides, or download our complete Planting Guide for tips on caring for your plants when you receive your order, as well as planting instructions for Perennials, Spring-Planted Bulbs, Fall-Planted Bulbs, Cacti & Succulents, Xeric Plants and more.

Shipping

Plant Shipping: Buy now and we will ship your order at the ideal planting time for your region. Spring-Planted Perennial and Bulb orders will ship from February 27-June 30, warmest zones first. Most plant orders will arrive within 3-4 days, or less, of leaving our greenhouses. This prompt delivery is provided without additional express charges.

Grass Plugs & Seed: Most orders ship within 5-8 business days (all zones).

Gardening Goods: All non-plant items ship within 2-3 days.

Standard shipping costs are $4.99 and up, depending on the size of the order.

Make Fast Even Faster: For ‘Rush’ same week delivery, please call customer service at 800-925-9387.

More Shipping Info

Grass Plugs & Seed: Most orders ship within 5-8 business days (all zones).

Gardening Goods:All non-plant items ship within 2-3 days.

Standard shipping costs are $4.99 and up, depending on the size of the order.

Make Fast Even Faster: For ‘Rush’ same week delivery, please call customer service at 800-925-9387.

More Shipping Info

Reviewsby PowerReviews

Q & A

USDA Hardiness Planting Zones

To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.

  • If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
  • If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).

Find Your Planting Zone:

Enter your Zip Code to find your USDA Planting Zone

You are using an out-of-date browser. You will still be able to shop HighCountryGardens.com, but some functionality may not work unless you update to a modern browser. Update My Browser

×

Please wait...

Item added to your cart

has been added to your cart.