National Botanic Garden of Wales, United Kingdom

Common name: gold y gors, swamp marsh marigold 'Plena'

Family: Ranunculaceae (blodyn ymenyn / buttercup)

Synonym: Caltha palustris var. palustris 'Plena'

Distribution: Gardd/Garden

Hardiness: (H7) Very hardy. < -20°C (USDA 6a-1)

Life form: Herbaceous perennial • Perlysiau lluosflwydd

Geirdarddiad / Etymology: Caltha (KAL-tha): Cup, referring to shape of flowers.

Geirdarddiad / Etymology: palustris (pal-US-triss): Marsh-loving.

Description: A strong-growing 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.