Acer palmatum 'Inazuma' (M) | Japanese maple 'Inazuma'

Trees

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A deciduous tree, up to around 10m high, with palmate leaves divided into long, tapering lobes. Leaves emerge bright reddish purple in spring, and develop to dark purple and olive green, before turning deep crimson in autumn. Winged seeds are also tinted red in autumn

Position

Full sun, Partial shade

Soil Types

Clay, Loam, Sand

Max Height

8-12 metres

Max Spread

4-8 metres

Size

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

Growing Conditions

Clay Loam Sand

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

Position

Full sun Partial shade

Aspect: East–facing or South–facing or West–facing
Exposure: 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
Horticultural Group

Horticultural Classification Codes

Horticultural Classification Codes are often given to genera which have a large number of species or cultivars. They are used to categorise cultivated plants based on specific, shared characteristics such as shape, colour, size or flowering time, and can be displayed as letters or numbers

For example:
Dahlia ‘Sunset Kate (Sin) = Single flower
Rosa ‘Marigold’ (HT) = Hybrid Tea: Acers in this matsumurae group are deeply divided to around three quarters of the leaf with coarsely-toothed edges and narrow, pointed lobes

How to Grow

Cultivation

Grow in moisture-retentive, well-drained, ideally slightly acidic soil, in a sheltered position with protection from drying winds. Thrives in part shade, though some sun is needed to develop the leaf colour; will tolerate full sun if soil is reliably moist. Mulch in spring to improve moisture retention. See Japanese maples cultivation

Propagation

Propagate by layering or grafting

Suggested planting locations and garden types

Architectural
Low Maintenance

Pruning

Minimal pruning required; see pruning group 1. Prune from late autumn to mid-winter only

Pests

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

Diseases

May be susceptible to Verticillium wilt, Acer leaf scorch and honey fungus