Height: 15-90cm (6-36in)
Water depth: up to 15cm (Gin)
Features:spring to summer
Site: sun or partial shade
In late winter, few sights are more encouraging than the newly emergingof kingcups. The golden, buttercup-like heads follow in spring, on thick, fleshy .
Popular species and varieties:
Caltha palustris grows into a 30-45cm tall clump of dark green, heart-shaped leaves. It has single, golden yellowin mid spring. Varieties include ‘More Pleno’, a free-flowering form with double yellow flowers, and the smaller alba, I 5cm (6in), with single white flowers and yellow stamens. The latter prefers moist soil or up to 2.5cm ( 1 in) of water. Caltha polypetala (giant kingcup) reaches 90cm (3ft) tall and has a sprawling habit. The dark green leaves and golden yellow flowers are larger than those of C. palustris, and appear later in the season.
Plant early spring to early autumn in sun or light shade, in water up to 15cm (6in) deep, or in moist soil.
Propagation: Divide and replant thein late spring or early summer. The double form does not produce ; germination of species is erratic, and the variable.
Pests and diseases: Rust andcan be a nuisance.