Caltha palustris var. palustris 'Plena' (d)

RHS Plant Profile
swamp marsh marigold 'Plena'

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swamp marsh marigold 'Plena' RHS

Synonyms

Caltha palustris 'Plena'
Caltha palustris var. plena

Aquatic Bogs Herbaceous Perennial
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A vigorous marginal aquatic perennial, to 60cm tall, with creeping rhizomes and rounded, deep green leaves. Fully-double, deep yellow flowers, up to 8cm across, are produced on branched, upright stems in spring

Position

Full sun

Soil Types

Loam

Max Height

0.5-1 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
2–5 years
Max Spread
0.5-1 metres
Max Height
0.5-1 metres

Growing Conditions

Loam
Moisture
Poorly–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
West–facing or South–facing or East–facing
Exposure
Exposed or Sheltered
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)
H7

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Ranunculaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Potentially harmful
Leaves are poisonous if ingested. Wear gloves and wash hands after handling
Genus
Caltha are rhizomatous herbaceous perennials with simple, usually heart-shaped leaves and cup-shaped yellow or white flowers in early spring
Name Status
Accepted

How to Grow

Cultivation

Grow in an open site in rich boggy soil at the water's edge in full sun. See pond plants and bog gardens for further advice

Propagation

Propagate by division in late summer or early spring

Suggested planting locations and garden types

  • Cottage and informal garden
  • Wildlife gardens

Pruning

Cut back after flowering

Pests

Generally pest-free

Diseases

Powdery mildews may be a problem