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Herbaceous Perennial

Agastache rupestris
  • RHS Plants for pollinators

rocky giant hyssop

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 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

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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