Caltha leptosepala

RHS Plant Profile
white-flowered marsh marigold

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white-flowered marsh marigold visionspictures.com
white-flowered marsh marigold visionspictures.com

Other common names

white-flowered marsh marigold

Synonyms

Caltha biflora var. rotundifolia, Caltha chelidonii, Caltha rotundifolia, Caltha uniflora

Bogs Herbaceous Perennial
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A deciduous, perennial, marginal water plant to 30cm high and wide with glossy, dark green, heart-shaped leaves and yellow-centred white flowers up to 4cm across in spring

Position

Full sun

Soil Types

Loam

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

Loam
Moisture
Poorly–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
South–facing or West–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
Genus
Caltha are rhizomatous herbaceous perennials with simple, usually heart-shaped leaves and cup-shaped yellow or white flowers in early spring
Name Status
Correct
Plant Range
W N America

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 or by division

Suggested planting locations and garden types

  • Wildlife gardens

Pruning

No pruning required

Pests

Generally pest-free

Diseases

May be susceptible to Powdery mildews