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Herbaceous Perennial

Agastache rupestris
  • RHS Plants for pollinators

rocky giant hyssop

A. rupestris is a perennial, to around 1m tall, with silvery-green, narrow leaves that are scented like liquorice and mint. It bears flower spikes of tubular, pinky-orange flowers through the summer and autumn

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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 Grey Silver
Summer Orange Pink Green Grey Silver
Autumn Orange Pink Green Grey Silver
Winter
Position
  • Full sun
Aspect

West–facing or East–facing or South–facing

Exposure
Sheltered
Drought resistance
Yes
Hardiness
H3
Botanical details
Family
Lamiaceae
Native to the UK
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

How to grow

Cultivation

Grow in reasonably well-drained soil in full sun. Drought tolerant. Not as hardy as broader-leaved species

Propagation

Propagate by seed

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

Remove spent flowering spikes through the season

Pests

Generally pest free

Diseases

May be affected by powdery mildews

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