General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun
Minimum cold hardiness: Zone 6a -23.3 °C (-10 °F) to -20.6 °C (-5 °F)
Maximum recommended zone: Zone 10b
Plant Height: 18 - 24 inches
Plant Spread: 14 - 18 inches
Leaves: Fragrant
Flowers: Showy
Fragrant
Flower Color: Lavender
Other: Blue-violet, Lavender-blue
Flower Time: Late spring or early summer
Summer
Late summer or early fall
Suitable Locations: Xeriscapic
Uses: Cut Flower
Dried Flower
Will Naturalize
Suitable as Annual
Wildlife Attractant: Bees
Birds
Butterflies
Hummingbirds
Resistances: Deer Resistant
Rabbit Resistant
Propagation: Seeds: Can handle transplanting
Other info: Good self-seeder
Propagation: Other methods: Division
Containers: Suitable in 3 gallon or larger
Needs repotting every 2 to 3 years
Needs excellent drainage in pots
Miscellaneous: Patent/Plant Breeders' Rights: PP19145

Image
Trade name information:
Series: Color Spires®
Trade Name: Steel Blue
Cultivar name: 'Aga 404'
Common names
  • Hyssop
  • Anise Hyssop

'Aga 404' was a featured
Plant of the Day for August 17, 2019.
Photo Gallery
Location: My garden in Kentucky
Date: 2007-08-29
#pollination
Location: My garden in Kentucky
Date: Jun 2, 2008 6:11 PM
Location: My garden in Kentucky
Date: Jun 4, 2008 4:55 PM
Location: My garden in Kentucky
Date: Jun 4, 2008 3:57 PM
Location: My garden in Kentucky
Date: 2011-07-09
Growing 'Color Spires Steel Blue' in a container, even though it'
Location: My garden in Kentucky
Date: 2011-07-09
Growing 'Color Spires Steel Blue' in a container, even though it'
Location: My garden in Kentucky
Date: 2007-07-23
Comments:
  • Posted by Marilyn (Kentucky - Zone 6a) on Mar 15, 2013 2:04 AM concerning plant:
    Agastache Color Spires Steel Blue has been growing in my garden, either in a container or in the ground since it was introduced in 2007 or 2008.

    I love the color of the flowers! It grows shorter than Agastache Color Spires Pink, which I also grow, but it's still enjoyable and beautiful.

    In 2008, I planted two plants of Color Spires Steel Blue in my flowerbed and they have survived the winters here. I also planted one plant of it, in 2008 or 2009, into a container that sits on my patio, which gets full sun, and it has survived the winters too.

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