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AquaticBogsHerbaceous Perennial

Caltha palustris var. palustris 'Plena' (d)

swamp marsh marigold 'Plena'

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

Synonyms

Caltha palustris 'Plena'
Caltha palustris var. plena

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Ultimate height

0.5–1 metres

Time to ultimate height

2–5 years

Ultimate spread

0.5–1 metres

Loam

Moisture

Poorly–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

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)

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

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