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Herbaceous Perennial

Agastache 'Summer Sunset'PBR
  • RHS Plants for pollinators

giant hyssop 'Summer Sunset'

A compact perennial to around 50cm tall with clumps of erect, branched stems bearing aromatic, grey-green leaves and spikes of tubular, pink-flushed orange flowers arranged in whorls from summer into autumn

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Size
Ultimate height
0.1–0.5 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

South–facing or West–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

Accepted

How to grow

Cultivation

Grows best in well-drained, fertile soils in full sun

Propagation

Propagate by seed, by division or by semi-ripe cuttings

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

No pruning required but deadheading may prolong flowering

Pests

Generally pest-free

Diseases

May be susceptible to powdery mildews

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