Magnolia × veitchii 'Isca'

RHS Plant Profile
magnolia 'Isca'

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magnolia 'Isca' RHS
magnolia 'Isca' RHS
magnolia 'Isca' RHS
Trees

Vigorous, large, deciduous tree about 25m in height, with large, dark green leaves to 30cm long, and bearing satin-textured, pure white, goblet-shaped flowers, faintly pink-tinged at the petal bases, on bare branches in mid-spring

Position

Full sun, Partial shade

Soil Types

Clay, Loam, Sand

Max Height

Higher than 12 metres

Max Spread

wider than 8 metres

Size

Time to Maturity
20–50 years
Max Spread
wider than 8 metres
Max Height
Higher than 12 metres

Growing Conditions

Clay Loam Sand
Moisture
Moist but well–drained
pH
Acid or Neutral

Position

Full sun Partial shade
Aspect
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)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Magnoliaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy, Columnar upright
Genus
Magnolia can be deciduous or evergreen trees or shrubs, with large, showy, often fragrant flowers, often opening before the leaves, and sometimes followed by colourful cone-like fruit
Name Status
Accepted

How to Grow

Cultivation

Grow in moist but well-drained, neutral to acid soil in full sun or partial shade with shelter from cold winds. Late frosts may damage buds and/or flowers. See magnolia cultivation

Propagation

Propagate by softwood or semi-ripe cuttings

Suggested planting locations and garden types

  • Architectural
  • Cottage and informal garden

Pruning

Magnolia pruning should be carried out in midsummer when in full leaf

Pests

May be susceptible to scale insects, horse chestnut scale and capsid bug

Diseases

May be susceptible to coral spot, phytophthora, grey moulds, honey fungus, a virus or fungal leaf spot