Phlox paniculata 'Blue Evening'

RHS Plant Profile
perennial phlox 'Blue Evening'

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perennial phlox 'Blue Evening' RHS / Joanna Kossak
perennial phlox 'Blue Evening' RHS / Joanna Kossak
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Herbaceous Perennial
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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

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
0.5-1 metres

Growing Conditions

Chalk Clay Loam
Moisture
Moist but well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun Partial shade
Aspect
South–facing or West–facing or East–facing
Exposure
Exposed or Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H7

Colour & Scent

Fragrance Flower
Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Polemoniaceae
Native to GB/Ireland
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. See phlox cultivation for further advice

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