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Agastache 'Blue Boa' (Giant hyssop 'Blue Boa')

Other names: Hummingbird mint 'Blue Boa', Anise hyssop 'Blue Boa'

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Variety or Cultivar
'Blue Boa' is an upright, clump-forming, herbaceous perennial with ovate to lance-shaped, aromatic, dark green leaves and wide, whorled spikes of tubular, two-lipped, fragrant, dark violet flowers from early summer into autumn.
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Season of interest

Flower

Spring Summer Autumn Winter
Flower

Foliage

Spring Summer Autumn Winter
Foliage
Height and spread

Height and spread

Size Max height Max spread To maturity
0.6 m 0.45 m 2-5 years
1 ft 1 ft 2-5 years

Where to grow

Soil type
  • Chalky
  • Loamy
  • Sandy
Soil drainage
  • Moist but well-drained
  • Well-drained
Soil pH
  • Acid
  • Alkaline
  • Neutral
Sunlight
  • Full Sun
Aspect
  • West
  • South
Exposure
  • Exposed
  • Sheltered

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Additional plant details

Cultivation

Plant in fertile, well-drained soil in full sun. Prefers alkaline soil but will tolerate poor, acid conditions. Dislikes heavy clay. Drought and heat tolerant once established. Apply a thick winter mulch in cold areas. Often short-lived.

Suggested uses

Gravel, Ground Cover, Beds and borders, Cottage/Informal, City, Garden edging

UK hardiness

H4

USDA zones

Zone 5, Zone 6, Zone 7, Zone 8, Zone 9, Zone 10

Sunset zone

4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24

WUCOLS

North-Central Coastal = Unknown
Central Valley = Unknown
South Coastal = Unknown
South Inland = Unknown
High and Intermediate Desert = Unknown
Low Desert = Unknown

Foliage

Deciduous

Habit

Upright

Native to

Garden origin

Drought tolerant

No

Flood tolerant

No

Fragrance

Leaves are anise-scented.

Toxicity

Not toxic

Plant care

Pruning

Cut back the faded flower-stems in autumn or leave for winter interest and cut back in spring. In colder areas, leave leaf and flower stems for winter protection and cut back in late winter or early spring.

Propagation methods

Division, Semi-ripe cuttings

Pests

Diseases

Powdery mildew

Leaf spot

Rust

Crown rot

Plant container grown plants in deep fertile, well-drained soil

Cut untidy foliage and spent flower stalks (optional)

Divide and replant in spring

Plant container grown plants in a sunny sheltered spot

Protect in winter with dry mulch (in cold areas)

Take semi-ripe cuttings

Other plants

Plants in this Genus (0)

Agastache

Companion plants (0)

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