Lysimachia nemorum aka Yellow Pimpernel

Lysimachia nemorum belongs to the primrose family, Primulaceae. It is an evergreen perennial: it lives for years and stays green. Common names include yellow pimpernel, wood pimpernel, and wood loosestrife. It is native to western and central Europe. This includes Britain and Ireland. Its range runs from Norway south to Spain. It reaches the Carpathians in the east. In the wild, it grows in woods and on shaded hedgebanks. These sites give useful clues to its place in gardens.

Plants For A Future gives its height as 1.6 feet [0.5 metres]. The supplied sources do not state its mature spread. They give no detailed account of this species' leaves or fruit. Flowers bloom from May to September, a long flowering season. Each flower has both male and female organs. Bees and flies pollinate the flowers. The plant is self-fertile: it can set seed with its own pollen. Plants For A Future says it keeps its leaves all year.

This species is easy to grow in moist or wet loam. It also grows in sand and clay, even heavy clay. It can grow in mildly acid, neutral, or mildly alkaline soil. Grow it in sun or part shade with ample soil moisture. Woodland edges, dappled shade, and hedgerows suit these needs. It can grow on the sunny edge of woods, too. Plants For A Future lists USDA zones 5–9. It also reports hardiness to at least −25°C. The supplied evidence names no pests or diseases specific to this species.

Raise new plants from seed, by division, or from basal cuttings. Sow seed in a cold frame in spring or autumn. Move seedlings into their own pots when large enough to handle. Plant them outside in summer. Divide plants in spring or autumn. Plant large divisions straight into their final sites. Keep small ones in pots until their roots grow well. Take basal cuttings in March or April, with some underground stem. Keep the potted cuttings in light shade while they root.

Plants For A Future records no known edible uses. It gives the plant an edibility score of zero. It notes a traditional astringent use for wounds and bleeding. This reported use does not mean the treatment is safe. The source lists no known hazards, but this does not prove safety. It records no other uses and flags no weed potential.