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Caltha palustris

Kingcup

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Key information

Plant type

Marginal

Flower colour

Yellow

Feature

Flowers

Hardiness

Hardy

Skill level

Beginner

Caltha palustris

Plant details

Kingcups (or marsh marigolds), Caltha palustris, grow wild alongside streams and in shallow water around ponds, forming loose clumps of kidney-shaped leaves, each up to 8-10cm across. In late spring and early summer, large, shiny golden flowers like giant, waxy buttercups appear. These are attractive to a wide range of pollinators. It makes a striking plant for the edge of a large garden pond. The Royal Horticultural Society has given it its prestigious Award of Garden Merit (AGM).

Grow Caltha palustris in planting baskets in shallow water round the edge of a pond. It also makes a good bog garden plant, and grows well in borders that become waterlogged in winter.

Family: Ranunculaceae

Genus: Caltha

Species: palustris

Plant type: Marginal

Flower colour: Yellow

Foliage colour: Dark green

Feature: Flowers

Sun exposure: Full sun

Soil: Moist, Boggy

Hardiness: Hardy

Skill level: Beginner

Height: 25cm

Spread: 45cm

Time to divide plants: August to September


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