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.
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 Agastache rupestris and Agastache cana will struggle.
Item Package Size
Plant - 5" Deep Pot
Blue Giant Hyssop
4, 5, 6, 7, 8
Mid to late summer
Attract Butterflies, Deer Resistant, Native, Extended Bloom Time (more than 4 weeks), Fragrant Flower / Foliage, Rabbit Resistant
Anywhere In The US, Northeast, Midwest, West, Southwest, Pacific Northwest
Spring / Summer, Fall
Ships To Canada
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
Provide a fast draining soil that's naturally low in fertility, Don't plant into clay soils.
Plant in full hot sun.
Just a few handfuls of compost in the planting hole is enough. Don't plant into a rich, highly amended soil..
Fertilize the Agastache just once in fall with Yum Yum Mix.
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.
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.
No longer available this season.
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