Acer campestre 'William Caldwell'

RHS Plant Profile

field maple 'William Caldwell'

Synonyms

Acer campestre 'King Canute'

Trees

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A deciduous tree, up to around 18m at maturity, with an upright habit. The small, five-lobed leaves turn vivid orange-red in autumn. Small green flowers in spring are followed by red winged seeds

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

Higher than 12 metres

Max Spread

4-8 metres

Size

Time to Maturity: 20–50 years
Max Spread: 4-8 metres
Max Height: Higher than 12 metres

Growing Conditions

Chalk Clay Loam Sand

Moisture: Moist but well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun Partial shade

Aspect: South–facing or North–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): H6

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Sapindaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Columnar upright
Genus: Acer can be deciduous trees or large shrubs with paired, often palmately-lobed leaves and small flowers followed by characteristic winged fruits. Many have fine autumn colour, and some have ornamental stems
Name Status: Accepted

How to Grow

Cultivation

Thrives in a fertile, moist but well-drained soil in full sun or part shade, but will tolerate a range of soils and positions

Propagation

Take softwood cuttings in early summer

Suggested planting locations and garden types

Architectural
Cottage and informal garden
Wildlife gardens
Low Maintenance

Pruning

Pruning group 1 but prune only from late autumn to midwinter

Pests

May be susceptible to gall mites, aphids, caterpillars and horse chestnut scale

Diseases

May be susceptible to tar spot, verticillium wilt and honey fungus