Acer palmatum 'Toyama-nishiki' (Dw/v) | Japanese maple 'Toyama-nishiki'

John Fielding

Synonyms

Acer palmatum var. dissectum 'Beni-shidare Tricolor'
Acer palmatum 'Beni-shidare Tricolor'
Acer palmatum 'Goshiki-shidare'
Acer palmatum 'Beni-shidare Variegated'
Acer palmatum var. dissectum 'Goshiki-shidare'

Shrubs Trees

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A small, rounded, bushy tree growing slowly to about 1.5m in height. The 7 or 9 lobed, very dissected, lacy leaves have a basic leaf colour of purple-red to greenish red, variegated and streaked randomly pink or white, more intensely coloured when grown in shade, turning orange and yellow in autumn. Inconspicuous hanging clusters of small, green flowers are followed by red-flushed, winged seeds

Position

Full sun, Partial shade

Soil Types

Clay, Sand, Loam

Max Height

1-1.5 metres

Max Spread

1-1.5 metres

Size

Time to Maturity: 5–10 years
Max Spread: 1-1.5 metres
Max Height: 1-1.5 metres

Growing Conditions

Clay Sand Loam

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

Position

Full sun Partial shade

Aspect: East–facing or North–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): H5

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Sapindaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Bushy
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 dwarf group are compact and slow-growing, making them ideal for pots and containers

How to Grow

Cultivation

Grow in any moisture-retentive, well-drained soil in a sheltered position. Leaf colour is best in partial shade, although full sun can be tolerated if soil is reliably moist. Leaf scorch can be caused by lack of soil moisture or excessive exposure. Suits container cultivation but attention to watering is needed in dry spells during the growing season. Suitable for bonsai cultivation. See Japanese maple cultivation

Propagation

Propagate by layering in autumn, grafting in late winter or softwood cuttings

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Patio and container plants
Flower borders and beds

Pruning

Very little to no pruning required. If necessary Pruning group 1 from late autumn to midwinter 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