Perennial of the Primulaceae family, this tiny variety is native to Japan, where it colonizes the edges of humid paths, shaded banks, and cool grassy areas of plains and low mountains.
It forms an extremely dense and tight creeping carpet, barely exceeding 2 to 3 cm in height. The stoloniferous stems root as they progress, creating a compact and regular ground cover. The leaves are tiny, rounded to oval, medium green slightly velvety, arranged in close pairs along the stems, giving the foliage a finely textured and mosaic-like appearance.
The flowers are bright yellow, star-shaped, borne individually in the leaf axils, and multiply in such quantity that they almost completely cover the green carpet at the time of anthesis. In its natural habitat, its flowering extends from May to July. In cultivation, it generally blooms in May-June.
It is cultivated in fresh, well-drained but not dry soil, in partial shade or light shade. Its progression remains reasonable and manageable, making it a valuable ground cover to fill the gaps of shaded pavings, the edges of ponds, or low-relief humid rockeries.