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Acer rubrum Summer Red ('Hosr')

red maple [Summer Red]

An oval-headed then broadly pyramidal, deciduous tree about 15m tall, the 3-5 lobed palmate, dark green leaves to 10cm long, the new summer growth is reddish as well as the young spring leaves, then turning yellow, orange and red in autumn. Upright clusters of tiny red flowers are borne in spring followed by dark red winged fruits in autumn

Synonyms
Acer rubrum 'Hosr'
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Size
Ultimate height
Higher than 12 metres
Time to ultimate height
10–20 years
Ultimate spread
Wider than 8 metres
Growing conditions
Clay
Sand
Loam
Moisture
Moist but well–drained
pH
Acid, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Red Green Red
Summer Green Red
Autumn Yellow Orange Red Red
Winter
Position
  • Full sun
  • Partial shade
Aspect

East–facing or South–facing or West–facing

Exposure
Exposed or Sheltered
Hardiness
H6
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

Trade

How to grow

Cultivation

Grow in fertile, moist but well-drained soil in sun or partial shade. Fairly lime-tolerant but best grown in acid soil for best leaf colour. See tree cultivation for further advice

Propagation

Propagate by seed (trees and shrubs), layering in autumn, grafting in late winter or softwood cuttings in early summer Grow in fertile, moist but well-drained soil in sun or partial shade. See tree cultivation for further advice

Suggested planting locations and garden types
  • Architectural
  • Cottage and informal garden
  • Wildlife gardens
Pruning

Pruning group 1, if necessary, 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

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