• 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

Zelkova carpinifolia

Caucasian elm

Caucasian elm

© RHS

  • Other common names Caucasian elm

  • Synonyms Planera richardii
    Zelkova crenata

  • Family Ulmaceae

  • Genus Zelkova are large deciduous trees or shrubs with neatly serrate, ovate leaves and inconspicuous flowers and fruit; good autumn colour

  • Details Z. carpinifolia is a large, broadly upright tree normally with a short stout trunk and many erect branches. The neatly toothed, oval leaves are rich green, turning orange-brown in autumn. Flowers and fruit are green and insignificant

  • Plant range Caucasus

Characteristics

  • Foliage Deciduous

  • Habit Spreading / Branched

  • 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 North-facing or East-facing or South-facing or West-facing

  • Exposure Sheltered

Soil

  • Loam

    Loam

  • Chalk

    Chalk

  • Clay

    Clay

  • MoistureWell-drained, Moist but well-drained

  • SoilLoam, Chalk, Clay

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height Higher than 12 metres

  • Ultimate spread wider than 8 metres

  • Time to ultimate height more than 50 years

How to grow

Cultivation Grow in deep, fertile, moist soil and protect from cold, drying winds

Propagation Propagate by softwood cuttings from young plants in summer or by grafting in winter. Alternatively, propagate by seed sown outdoors in autumn

Suggested planting locations and garden types Low Maintenance

How to care

Pruning Pruning group 1

Pests May be affected by horse chestnut Scale insects

Diseases May be affected by Dutch elm disease and bacterial canker

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