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Herbaceous Perennial

Agastache urticifolia
  • RHS Plants for pollinators

nettle-leaved giant hyssop

A tall perennial up to 2m high, with square stems holding pairs of slightly glossy, strongly aromatic, lance-shaped to triangular green leaves with coarsely serrated edges. Short dense spikes of small pale pink, violet or white flowers are produced from mid to late summer

Other common names
horse nettle

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Size
Ultimate height
1.5–2.5 metres
Time to ultimate height
2–5 years
Ultimate spread
0.5–1 metres
Growing conditions
Chalk
Loam
Sand
Moisture
Moist but well–drained, Well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Pink Purple White Green
Autumn Green
Winter
Position
  • Full sun
  • Partial shade
Aspect

East–facing or South–facing or West–facing

Exposure
Exposed or Sheltered
Hardiness
H4
Botanical details
Family
Lamiaceae
Native to the UK
No
Foliage
Deciduous
Habit
Clump forming
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

Thrives in fertile, moist but well-drained soil in sun or light shade

Propagation

Propagate by seed or by division in spring

Suggested planting locations and garden types
  • Architectural
  • Cottage and informal garden
  • Prairie planting
  • Wildflower meadow
  • Wildlife gardens
  • Flower borders and beds
Pruning

Remove spent flowering spikes as they fade

Pests

Generally pest-free

Diseases

May be susceptible to powdery mildews

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