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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 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

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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