• 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

Caltha palustris

marsh marigold

  • Other common names marsh marigold

    brave bassinets
    bull flower
    cow lily
    crazy Beth
    horse blob
    May blob
    mare blob
    meadow buttercup
    meadow cowslip
    meadow gowan
    publican's cloak
    soldier's buttons
    water boots
    water buttercup
    water cowslip
    water dragon
    water goggles
    water gowan
    yellow gowan

    see more
  • Synonyms Caltha cornuta

  • Family Ranunculaceae

  • Genus Caltha are rhizomatous herbaceous perennials with simple, usually heart-shaped leaves and cup-shaped yellow or white flowers in early spring

  • Details C. palustris is a rhizomatous herbaceous perennial to 50cm, with rounded, rich green leaves and clusters of deep yellow flowers 4cm in width

  • Plant range Temp. N. Hemis.


  • Foliage Deciduous

  • Habit Clump-forming

  • 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 South-facing or West-facing

  • Exposure Exposed


  • Loam


  • MoisturePoorly-drained

  • SoilLoam

  • pHAcid, Alkaline, Neutral


  • Ultimate height 0.1-0.5 metres

  • Ultimate spread 0.1-0.5 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Grow in an open site in rich boggy soil at the water's edge in full sun

Propagation Propagate by seed sown as soon as ripe or by division in late summer or early spring

Suggested planting locations and garden types Low Maintenance Wildlife Gardens

How to care

Pruning Cut back after flowering

Pests Generally pest free

Diseases Powdery mildews may be a problem

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