Pterocarya fraxinifolia

RHS Plant Profile
Caucasian wingnut

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Caucasian wingnut RHS
Caucasian wingnut RHS
Caucasian wingnut RHS / Joanna Kossak

Other common names

Caucasian walnut

Synonyms

Pterocarya pterocarpa
Pterocarya caucasica

Trees
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A vigorous, broadly spreading deciduous tree with large pinnate leaves and small green flowers in drooping racemes to 50cm long, followed by winged fruits

Position

Full sun

Soil Types

Clay, Loam, Sand

Max Height

Higher than 12 metres

Max Spread

wider than 8 metres

Size

Time to Maturity
20–50 years
Max Spread
wider than 8 metres
Max Height
Higher than 12 metres

Growing Conditions

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

Position

Full sun
Aspect
West–facing or South–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)
H6

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Juglandaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
Genus
Pterocarya are tall deciduous trees with large pinnate leaves and tiny flowers in pendulous catkins, followed by spikes of winged fruits
Name Status
Correct
Plant Range
E Turkey, N Iran, Caucasus

How to Grow

Cultivation

Grow in deep, fertile, moist but well-drained soil in full sun

Propagation

Propagate by seed in containers outdoors in autumn. Remove rooted suckers in autumn

Suggested planting locations and garden types

  • Architectural
  • Cottage and informal garden

Pruning

Pruning group 1; remove unwanted suckers and seedlings as they appear

Pests

Generally pest-free

Diseases

May be susceptible to honey fungus