• 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

Citrus japonica (F)

kumquat

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
kumquat

© RHS 2003

  • Other common names kumquat

  • Synonyms Citrus kinokuni
    Citrus madurensis

    Citrus × nobilis var. inermis
    Citrus kumquat
    Fortunella hindsii
    Fortunella japonica
    Fortunella margarita
    Fortunella × crassifolia

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  • Family Rutaceae

  • Genus Citrus are typically evergreen shrubs or trees, frequently spiny, with simple, leathery, aromatic leaves, usually with winged stalks, and often fragrant white or pink-tinged flowers, followed by large, juicy fruits

  • Details C. japonica is a large spiny evergreen shrub with glossy lance-shaped leaves and axillary clusters of fragrant white flowers 1.2cm across in spring and summer, followed by globose orange fruits 3-4cm across

Characteristics

  • Foliage Evergreen

  • 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)

    H1C

Colour

Sunlight

  • Full Sun

  • Aspect South-facing

  • Exposure Sheltered

Soil

  • Chalk

    Chalk

  • Clay

    Clay

  • Sand

    Sand

  • Loam

    Loam

  • MoistureMoist but well-drained

  • SoilChalk, Clay, Sand, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 2.5-4 metres

  • Ultimate spread 1.5-2.5 metres

  • Time to ultimate height 10-20 years

How to grow

Cultivation Grow outdoors in a moist but well-drained soil in a sheltered, frost-free area in full sun. Grow under glass in loam-based compost. Water sparingly in winter. Top dress in spring

Propagation Propagate by seed or semi-hardwood cuttings

Suggested planting locations and garden types Patio & Container Plants

How to care

Pruning Pruning group 1

Pests Prone to glasshouse red spider mite, glasshouse whitefly and scale insects under glass

Diseases Generally disease free

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