Magnolia denudata 'Swarthmore Sentinel'

RHS Plant Profile
yulan 'Swarthmore Sentinel'

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Trees

A deciduous tree reaching over 10m in height with ovate mid-green leaves. The fragrant, cup-shaped flowers, produced in spring before the leaves, are creamy white and prolific.

Position

Full shade, Partial shade

Soil Types

Clay, Loam, Sand

Max Height

Higher than 12 metres

Max Spread

4-8 metres

Size

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

Growing Conditions

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

Position

Full shade Partial shade
Aspect
South–facing or West–facing or East–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

Fragrance Flower
Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Magnoliaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
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 light shade with shelter from cold winds. Late frost may damage the flower buds. For more information see magnolia cultivation advice

Propagation

Propagate by taking semi-ripe cuttings or softwood cuttings

Suggested planting locations and garden types

  • Architectural
  • Cottage and informal garden
  • Flower borders and beds

Pruning

Pruning Group 1. See magnolia pruning

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