Caltha palustris 'Flore Pleno' (d)

RHS Plant Profile

marsh marigold 'Flore Pleno'

Dorling Kindersley 2003

Bogs Herbaceous Perennial Aquatic

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A rhizomatous, marginal aquatic perennial to 30cm, with dark green, rounded leaves and clusters of long-lasting, very double, bright deep yellow flowers 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: East–facing or South–facing
Exposure: Exposed
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: Bushy, 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: 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

Wildlife gardens
Cottage and informal garden

Pruning

Cut back after flowering

Pests

Generally pest-free

Diseases

Powdery mildews may be a problem