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Dactylorhiza praetermissa

southern marsh-orchid

Orchidaceae Western and central Europe

Attracts Pollinators

SunFull Sun – Part Shade

WaterHigh

HardinessZones 5–8

Overview

Dactylorhiza praetermissa is a hardy terrestrial orchid in the family Orchidaceae, growing 8-28 inches (20-70 cm) tall from a pair of palmately lobed underground tubers. Stout, hollow stems carry several broadly lanceolate green leaves that are usually unmarked, though some plants show faint spotting. The flower spike is a dense cylinder, 2-6 inches (5-15 cm) long, packed with pink to magenta-purple blooms; each flower has a broad, shallowly three-lobed lip patterned with darker dots and short looping lines. Plants grow in permanently wet, base-rich ground such as fens, marshes, wet meadows, and damp dune slacks. The tubers are renewed annually, with a new tuber forming beside the old as the season progresses. Establishment depends on symbiotic soil fungi, and plants are slow to settle and intolerant of soils that dry out in summer. Topgrowth dies back to the tuber in autumn, and the plant overwinters dormant below ground. It spreads by dust-like seed that germinates only where the appropriate fungal partner is present, so colonies build slowly.

Native Range

Native to western and central Europe, with a stronghold in lowland England and Wales and a range extending into the Low Countries, northern France, and Denmark. It occupies calcareous to neutral wetlands, including fens, marshes, wet grassland, and the damp hollows of coastal dunes.

Suggested Uses

Grown in bog gardens, at pond and stream margins, and in permanently moist wildflower meadows on neutral to limy soils. Planted in damp, naturalistic plantings where summer moisture is reliable. Combined with other wetland species such as marsh marigold and ragged robin in conservation and wildlife gardens.

How to Identify

Identify it by the stout, leafy stem topped with a dense cylindrical spike of pink to magenta flowers in early summer. The leaves are broad, keeled, and generally without spots, distinguishing it from the heavily spotted Dactylorhiza fuchsii. Each flower bears a broad three-lobed lower lip marked with dots and short loops, and a backward-pointing spur that holds no nectar reward for visiting insects.

Appearance

Size & Dimensions

Height8" - 2'4"

Width/Spread6" - 1'

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Bloom Period

~3 weeks

Summer

Flowering occurs from early June into July, with the spike opening from the base upward over two to three weeks. Plants in cooler or northern sites flower nearer the end of this window. Pollination is carried out chiefly by bumblebees, which visit the rewardless flowers and transfer pollinia between spikes.

Detailed Descriptions

Flower Description

pink to magenta-purple

Foliage Description

green

Growing Conditions

Sun Requirements

SunFull Sun SunPartial Shade

Requires 4-8 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range6.0 - 8.0(Neutral)

357912

Soil Types

loam silt peat chalk

Drainagewet

Water & Climate

Water Needs

High

Frost Tolerance

hardy

Time to Maturity

2-3 years

Care & Maintenance

Care Guide

Plants grow in full sun to light shade in soil that stays wet year-round, such as a bog garden, pond margin, or permanently moist border. Base-rich to neutral conditions suit them, with a loam enriched by leaf mould over a moisture-retentive base reproducing wetland ground. The root zone must stay damp through the growing season, as the tubers shrivel quickly once soil dries. High-nitrogen feeding favours competing vegetation and is not used for this orchid. Establishment is slow because the plant depends on soil fungi, and transplanted stock often takes a season to settle. Dormant tubers remain in place through winter after the topgrowth has died away.

Pruning

No pruning is required. Spent flower spikes may be cut after the seed has shed, or left standing to allow self-seeding into surrounding wet ground. The foliage yellows and dies down on its own in autumn.