Fraxinus americana 'Rosehill'

RHS Plant Profile
American ash 'Rosehill'

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American ash 'Rosehill' RHS / Joanna Kossak
American ash 'Rosehill' RHS / Joanna Kossak
American ash 'Rosehill' RHS / Joanna Kossak
Trees

A large, upright, deciduous tree which is pyramid-shaped when young becoming more rounded as it matures. Dark green oval-shaped leaves turn to shades of bronze, yellow and red in the autumn. On mature trees, the grey bark has diamond-shaped ridging

Position

Full sun, Partial shade

Soil Types

Chalk, 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

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

Position

Full sun Partial shade
Aspect
East–facing or North–facing or South–facing or West–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)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Oleaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Columnar upright
Genus
Fraxinus are medium-sized to large, mostly deciduous trees with attractive pinnate leaves, sometimes conspicuous flowers and autumn colour, and distinctive winged fruits
Name Status
Accepted

How to Grow

Cultivation

Grow in any well drained soil in full sun or partial shade

Propagation

Propagate by grafting

Suggested planting locations and garden types

  • Architectural
  • Low Maintenance

Pruning

Pruning group 1

Pests

Generally pest-free

Diseases

Ash dieback has recently been found in the UK. Restrictions have been put in place (from 29 October 2012) regarding both the importation of ash from abroad and the movement of ash within the UK. May also be susceptible to honey fungus