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Herbaceous Perennial

Agastache foeniculum (Pursh) Kuntze
  • RHS Plants for pollinators

anise hyssop

An upright, deciduous perennial forming a clump of leafy stems. The leaves are highly aromatic with a distinct aniseed scent, and have white undersides. The flower spikes are short, with broadly ovate bracts, and are a strong violet blue

Synonyms
Agastache anethiodora
Agastache anisata
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Size
Ultimate height
0.5–1 metres
Time to ultimate height
2–5 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Chalk
Loam
Sand
Moisture
Well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Blue Green
Autumn Blue Green
Winter
Position
  • Full sun
Aspect

South–facing or West–facing

Exposure
Exposed or Sheltered
Hardiness
H3
Botanical details
Family
Lamiaceae
Native to GB / Ireland
No
Foliage
Deciduous
Habit
Bushy
Genus

Agastache are herbaceous perennials with simple, aromatic leaves and small 2-lipped tubular flowers in whorls forming dense spikes, in summer and autumn; some are rather tender but can be grown as annual bedding

Name status

Correct

Plant range
N America

How to grow

Cultivation

Grow in sharply drained, fertile soil in full sun

Propagation

Propagate by seed or by division in spring

Suggested planting locations and garden types
  • Cottage and informal garden
  • Gravel garden
  • City and courtyard gardens
  • Flower borders and beds
Pruning

Remove spent flowering spikes through the season

Pests

Generally pest-free

Diseases

May be affected by powdery mildew

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