• 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

Quercus petraea

sessile oak

sessile oak


  • Other common names sessile oak
    durmast oak

  • Family Fagaceae

  • Genus Quercus can be deciduous or evergreen trees or shrubs, with entire, lobed or toothed leaves; flowers inconspicuous, followed by characteristic acorns; sometimes good autumn colour

  • Details Q. petraea is a large deciduous tree forming a broad, rounded crown, with rather leathery, dark green, lobed leaves to 15cm long, turning orange-brown in autumn. Inconspicuous yellowish flowers in catkins with the young leaves

  • Plant range Europe to W Russia


  • Foliage Deciduous

  • Habit Bushy

  • 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)




  • Full Sun

  • Partial Shade

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

  • Exposure Exposed or Sheltered


  • Chalk


  • Chalk


  • Chalk


  • Chalk


  • MoistureWell-drained, Moist but well-drained

  • SoilSand, Clay, Chalk, Loam

  • pHAcid, Alkaline, Neutral


  • Ultimate height Higher than 12 metres

  • Ultimate spread wider than 8 metres

  • Time to ultimate height more than 50 years

How to grow

Cultivation Grows well in most deep, fertile soils

Propagation Propagate by seed, sown as soon as ripe, in a cold frame

Suggested planting locations and garden types Flower borders and beds Cottage & Informal Garden

How to care

Pruning pruning group 1

Pests Susceptible to aphids, caterpillars, leaf-mining moths and oak gall wasps

Diseases May be affected by powdery mildew

Advertise here

Did you find the information you were looking for?

RHS members can get exclusive individual advice from the RHS Gardening Advice team.

Join the RHS now