Acer sikkimense

RHS Plant Profile

Sikkim maple

Synonyms

Acer hookeri

Trees

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A semi-evergreen maple, rare in cultivation suited to the mildest parts of the country. Ultimately to 12m tall, with red young shoots and usually entire, thick-textured leaves to 15cm long, emerging brilliant red in spring, maturing to glossy dark green, then crimson in autumn; clusters of small greenish-yellow spring flowers are followed by pendent racemes of small brown winged fruit

Position

Full sun, Partial shade

Soil Types

Loam, Sand

Max Height

8-12 metres

Max Spread

4-8 metres

Size

Time to Maturity: 10–20 years
Max Spread: 4-8 metres
Max Height: 8-12 metres

Growing Conditions

Loam Sand

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

Position

Full sun Partial shade

Aspect: East–facing or 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): H3

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Sapindaceae
Native to GB/Ireland: No
Foliage: Semi evergreen
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: Correct
Plant Range: E Himalaya, Sikkim, China

How to Grow

Cultivation

Grow in fertile, moist but well-drained soil in sun or partial shade. Suited to frost free, mild counties and sheltered inner city locations only, or initally in containers in a frost free greenhouse. See tree cultivation for further advice

Propagation

Propagate by seed, softwood cuttings, or by grafting

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Wildlife gardens
Patio and container plants
Sub-tropical
Coastal
Conservatory and greenhouse

Pruning

Pruning group 1, only from late autumn to mid-winter

Pests

May be susceptible to aphids and scale insects, including horse chestnut scale

Diseases

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