• 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

Gleditsia triacanthos f. inermis 'Sunburst'

honey locust 'Sunburst'

honey locust 'Sunburst'

© RHS 1986

  • Other common names honey locust 'Sunburst'

  • Family Caesalpiniaceae

  • Genus Gleditsia are deciduous trees with elegant, pinnate or bipinnate foliage, often on spiny branches, inconspicuous flowers followed by large flattened seed-pods

  • Details 'Sunburst' is a small deciduous tree with a rounded crown. Leaves bipinnate, with small, leaflets, golden-yellow in early summer, becoming greener in summer


  • 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

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

  • Exposure Sheltered or Exposed


  • Chalk


  • Chalk


  • Chalk


  • Chalk


  • MoistureWell-drained, Moist but well-drained

  • SoilChalk, Clay, Sand, Loam

  • pHAcid, Alkaline, Neutral


  • Ultimate height 8-12 metres

  • Ultimate spread 4-8 metres

  • Time to ultimate height 20-50 years

How to grow

Cultivation Grow as a specimen tree in any well-drained soil in full sun

Propagation Propagate by seed or grafting

Suggested planting locations and garden types Low Maintenance

How to care

Pruning Pruning group 1

Pests Foliage is often damaged by gall midge

Diseases Generally disease free

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