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Herbaceous Perennial

Agastache 'Raspberry Summer'PBR
  • RHS Plants for pollinators

giant hyssop 'Raspberry Summer'

'Raspberry Summer' is a bushy, aromatic, short-lived herbaceous perennial 60cm high with ovate to lance-shaped dark green leaves, 4-6cm long, and spikes up to 30cm long of dark raspberry-pink flowers from midsummer to 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
Summer Pink Green
Autumn Pink Green
Winter
Position
  • Full sun
Aspect

West–facing or South–facing

Exposure
Sheltered
Drought resistance
Yes
Hardiness
H2
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

Accepted

How to grow

Cultivation

Grow as an annual in colder areas, or as a perennial in warmer areas, in well-drained, fertile soil in full sun in a sheltered position, such as against a south-facing or west-facing wall

Propagation

Propagate by division in spring or by semi-ripe cuttings in early summer; it is a short-lived plant so propagate reserve plants each year; propagation for resale is prohibited without a licence

Suggested planting locations and garden types
  • Patio and container plants
  • City and courtyard gardens
  • Cottage and informal garden
  • Wall side borders
  • Flower borders and beds
Pruning

No pruning required but deadheading may prolong flowering

Pests

Generally pest-free

Diseases

Generally disease-free but may be affected by powdery mildews

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