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Agastache ‘Blue Boa’ (Giant Hyssop)

Hyssop 'Blue Boa', Anise Hyssop 'Blue Boa', Hummingbird Mint 'Blue Boa'

Agastache Blue Boa, Hyssop Blue Boa, Anise Hyssop Blue Boa, Hummingbird Mint Blue Boa,
Agastache Blue Boa, Hyssop Blue Boa, Anise Hyssop Blue Boa, Hummingbird Mint Blue Boa,

Adding lovely vertical lines to the landscape, Agastache ‘Blue Boa’ (Giant Hyssop) is a striking, upright herbaceous perennial forming a low tight mound of aromatic, ultra-green leaves. From early summer to fall, it boasts long and dense spikes of deep violet-blue flowers. They stand out in the garden and provide a bold visual appeal. Loved by bees and hummingbirds, it is perfect for use in sunny borders.

  • Grows up to 30-36 in. tall (75-90 cm) and 24 in. wide (60 cm). The aromatic leaves exude a licorice scent when crushed.
  • Easily grown in full sun, in average, dry to medium moisture, well-drained soils. Good drainage is particularly important. Although a drought-tolerant plant, it might need watering in extreme dry weather spells.
  • Provides a bold visual impact in beds and borders, cottage gardens, gravel gardens, butterfly gardens, or banks and slopes over a very long season.
  • Ideal to add color to the late-season garden when many other plants are fading.
  • Creates a stunning effect when mixed with other perennials or planted en masse.
  • Attracts streams of hummingbirds, butterflies, and other beneficial pollinators.
  • Generally disease and pest-free (might occasionally be subject to powdery mildew) and resistant to deer and rabbits.
  • Deadhead spent flowers to promote additional bloom.
  • Propagate by division in spring.

Requirements

Hardiness 5 - 9
Heat Zones 5 - 12
Climate Zones 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Perennials
Plant Family Lamiaceae
Genus Agastache
Common names Anise Hyssop, Hyssop, Hummingbird Mint
Exposure Full Sun
Season of Interest Summer (Early, Mid, Late)
Fall
Height 2' - 3'
(60cm - 90cm)
Spread 1' - 2'
(30cm - 60cm)
Spacing 24" (60cm)
Maintenance Low
Water Needs Low
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Cut Flowers, Fragrant, Showy
Tolerance Drought, Deer, Rabbit
Attracts Bees, Butterflies, Hummingbirds
Garden Uses Banks And Slopes, Beds And Borders
Garden Styles Informal and Cottage, Gravel and Rock Garden
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Alternative Plants to Consider

Agastache cana (Texas Hummingbird Mint)
Agastache ‘Raspberry Summer’ (Hummingbird Mint)
Agastache ‘Summer Fiesta’ (Hummingbird Mint)
Agastache ‘Summer Glow’ (Hummingbird Mint)
Agastache ‘Kudos Red’ (Hummingbird Mint)
Agastache POQUITO Butter Yellow (Dwarf Hummingbird Mint)

Recommended Companion Plants

Leucanthemum x superbum ‘Snowcap’ (Shasta Daisy)
Kniphofia ‘Mango Popsicle’ (Red Hot Poker)
Coreopsis ‘Moonlight’ (Tickseed)
Echinacea ‘Tomato Soup’ (Coneflower)

Find In One of Our Guides or Gardens

A Striking Summer Border Idea with Echinops and Agastache
How to Create an Enchanting Butterfly Garden
For the Love of Butterflies: Best Flowers to Attract them to Your Garden
6 Reasons You Should Create a Butterfly Garden
For the Love of Bees: Best Flowers to Attract them to Your Garden
How to Cultivate a Thriving Bee-Friendly Garden
Hummingbird
Wonderful Plants That Repel Insects
Agastache (Hyssop)
Best Flowers to Attract Hummingbirds
While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.
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Requirements

Hardiness 5 - 9
Heat Zones 5 - 12
Climate Zones 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Perennials
Plant Family Lamiaceae
Genus Agastache
Common names Anise Hyssop, Hyssop, Hummingbird Mint
Exposure Full Sun
Season of Interest Summer (Early, Mid, Late)
Fall
Height 2' - 3'
(60cm - 90cm)
Spread 1' - 2'
(30cm - 60cm)
Spacing 24" (60cm)
Maintenance Low
Water Needs Low
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Cut Flowers, Fragrant, Showy
Tolerance Drought, Deer, Rabbit
Attracts Bees, Butterflies, Hummingbirds
Garden Uses Banks And Slopes, Beds And Borders
Garden Styles Informal and Cottage, Gravel and Rock Garden
How Many Plants
Do I Need?
Explore Great Plant Combination Ideas
Agastache (Hyssop)
Guides with
Agastache (Hyssop)
Not sure which Agastache (Hyssop) to pick?
Compare Now

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