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Herbaceous Perennial

Phlox paniculata 'Blue Evening'
  • RHS Plants for pollinators

perennial phlox 'Blue Evening'

An upright herbaceous perennial growing to about 80cm with narrow dark green leaves, sometimes bronzy, on black stems. The fragrant flowers, produced from mid-summer to early autumn, are lilac, appearing bluer in evening light

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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
Clay
Loam
Moisture
Moist but well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Black Green
Summer Black Purple Green
Autumn Black Purple Green
Winter
Position
  • Full sun
  • Partial shade
Aspect

South–facing or West–facing or East–facing

Exposure
Exposed or Sheltered
Hardiness
H7
Botanical details
Family
Polemoniaceae
Native to the UK
No
Foliage
Deciduous
Habit
Clump forming
Genus

Phlox may be evergreen or herbaceous, mat-forming or erect perennials or shrubs, with simple leaves and salver-shaped flowers in terminal clusters

Name status

Accepted

How to grow

Cultivation

Grow in fertile, moist soil in full sun or partial shade

Propagation

Propagate by division in autumn or spring. Propagate by basal cuttings in spring or propagate by root cuttings in early autumn or winter

Suggested planting locations and garden types
  • Cottage and informal garden
  • City and courtyard gardens
  • Prairie planting
  • Wildlife gardens
  • Cut flowers
  • Flower borders and beds
  • Wall side borders
Pruning

Deadhead to prolong flowering then cut down to the base in late autumn

Pests

May be susceptible to stem eelworm

Diseases

May be susceptible to powdery mildews, and a leaf spot

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