About
Caltha minor is a rhizomatous perennial in the buttercup family that bears star-shaped flowers in March to May. It favours moist habitats and produces heart- or kidney-shaped leaves. The blooms have no true petals; their coloured sepals — yellow to white — provide the floral display. Plants spread by short rhizomes to form low clumps.
About the genus
Caltha is a genus of rhizomatous perennial flowering plants in the family Ranunculaceae, to which ten species have been assigned. They occur in moist environments in temperate and cold regions of both the Northern and Southern Hemispheres. Their leaves are generally heart-shaped or kidney-shaped, or are characteristically diplophyllous.
Wikipedia contributors, "Caltha", CC BY-SA 4.0 — Caltha
In the garden
Caltha minor belongs to the Ranunculaceae and naturally occupies moist places across temperate and cold regions of both hemispheres. As a rhizomatous perennial it establishes as low clumps of heart- or kidney-shaped leaves, emerging each spring to flower in March to May. The flowers are composed of distinctly coloured sepals rather than true petals, with a ring of stamens surrounding separate carpels. Place Caltha minor where the soil remains consistently damp: pond margins, marshy hollows and damp meadow edges suit it well. It tolerates cool conditions characteristic of temperate climates and will persist where moisture is reliable through the growing season. Management is simple — lift and split the rhizomes to reduce overcrowding or to propagate new plants — and avoid letting the soil dry out once growth begins. In garden use, the plant works where wet ground needs planting without resorting to true water plants, providing early-season flowers that precede most perennials. After flowering the coloured sepals fall back and the free carpels develop into seedheads, so allow some seed to set if you wish to encourage natural spread and maintain local genetic stock.
