• AGM plants

    AGM plants have been through a rigorous trial and assessment programme. They are:

    • Excellent for ordinary use in appropriate conditions
    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases

Magnolia stellata 'Centennial'

star magnolia 'Centennial'

AGM plants

AGM plants have been through a rigorous trial and assessment programme. They are:

  • Excellent for ordinary use in appropriate conditions
  • Available to buy
  • Of good constitution
  • Essentially stable in form & colour
  • Reasonably resistant to pests & diseases
star magnolia 'Centennial'

© RHS

  • Other common names star magnolia 'Centennial'

  • Family Magnoliaceae

  • 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

  • Details 'Centennial' slowly forms a large, deciduous shrub, producing fragrant, waterlily-shaped flowers in early to mid spring. These are white often with pink staining at the base of the petals

Characteristics

  • Foliage Deciduous

  • Habit Bushy

  • Fragrance Flower

  • 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

Sunlight

  • Full Sun

  • Partial Shade

  • Aspect South-facing or West-facing

  • Exposure Sheltered

Soil

  • Clay

    Clay

  • Sand

    Sand

  • Loam

    Loam

  • MoistureMoist but well-drained

  • SoilClay, Sand, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 1.5-2.5 metres

  • Ultimate spread 2.5-4 metres

  • Time to ultimate height 10-20 years

How to grow

Cultivation Grow in moist but well-drained neutral to acid soil in full sun or part shade with shelter from cold winds. Late frosts may damage flowers. Will grow in alkaline soil that is moisture retentive. Further magnolia cultivation advice

Propagation Propagate by softwood cuttings in spring or early summer, or semi-ripe cuttings in late summer and autumn

Suggested planting locations and garden types Low Maintenance Architectural City & Courtyard Gardens Cottage & Informal Garden Patio & Container Plants

How to care

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

Pests Susceptible to scale insects

Diseases Susceptible to coral spot, honey fungus and phytophthora root rot

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