Epipactis palustris aka Marsh Helleborine

Epipactis palustris is a ground orchid called marsh helleborine or marsh orchid. It belongs to the orchid family, Orchidaceae. This perennial grows in temperate parts of Europe and Asia. Kew gives its range as Europe through the Caucasus to Mongolia. It is native to Britain and Ireland. Other records include Turkey, northern Iran, and central Asia. It is largely absent from the Mediterranean region.

Plants reach about 2 feet (0.61 metres) tall and wide. Fleshy roots and long, creeping rhizomes grow beneath the soil. These rhizomes let plants spread out from the original clump. Plants also spread by self-seeding. Over time, they can form dense colonies rather than remain isolated clumps. Flowers appear from June to August. Their colours combine brownish purple with cream and green shades. The blooms give this orchid much of its garden value.

Wild plants grow in fens, damp pastures, seeps, and wet meadows. They also occupy dune slacks and old gravel pits. These sites often have neutral or lime-rich soil. Some flood for part of the year. Such wet ground can limit competition from other plants. In gardens, give this orchid soil that stays damp. It prefers soil that holds moisture but still drains. Nutrient-poor, lime-rich ground suits it well. Do not let the soil dry out between waterings.

Grow marsh helleborine in full sun or light shade. It can tolerate wet soil and seasonal flooding. This makes it an option for rain gardens. It also suits damp ground beside ponds and streams. Its spreading habit can help it fill suitable wet areas. Choose a site for its moisture needs, not just its flowers. A dry border does not match the growing conditions described for it.

Missouri Botanical Garden lists USDA hardiness zones 6–9. Its notes describe reliable winter hardiness in zone 7. Plants in zone 6 need protection. The same source calls it easy to grow in suitable soil. It rates the overall maintenance level as medium. Keeping the ground moist remains a key part of care. It reports no serious insect or disease problems. The supplied sources give no species-level evidence about food use or toxicity.