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botanical name:
Caltha palustris var. palustris
Caltha palustris var. palustris © Deeproot Plant Base
common name:  Giant Marsh Marigold, Giant Kingcup
synonyms:  Caltha polypetala
family:  Ranunculaceae
characteristics: perennial
height: 0.60m
width: 0.60m
growth rate: medium
growth habit: clump
leaf colour: dark green
flower colour: yellow
main season: Spring
aspect: full sun, part shade
conditions: wet/waterlogged soil, clay soil
preferred soil pH: any
minimum temp: -15°C
USDA zone: 3 to 8
Marginal water or bog plant. Generally larger all round than C. palustris, with particularly large yellow flowers in spring. The flowers have just 5 or 6 sepals. Rounded, thick, dark green leaves.

Fertile, wet, boggy soil in sun or part shade. Can be planted as a pond marginal in very shallow water, to a depth of up to 15cm, or preferably at the water's edge .

other notes:
Often incorrectly sold as Caltha polypetala, which is a smaller species.
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