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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

photo by Ron Evans, copyright GAP Photos (199640)

Plant details

Kingcups (or marsh marigolds) grow wild alongside streams and in shallow water around ponds, forming loose clumps of kidney-shaped leaves, each up to 8-10cm (3-4in) across in late spring and early summer, large, shiny golden flowers like giant, waxy buttercups appear. Plants enjoy moist conditions and can be grown in planting baskets in shallow water round the edge of a pond, where they look their best when their reflections are seen in water. They also make good bog garden plants, and grow well in borders that waterlog in winter. The Royal Horticultural Society has given it its prestigious Award of Garden Merit (AGM).

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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