the tall sedge of NZ's lowland swamps and stream banks
- Size
- Height: 40–80 cm
- Lifespan
- 5–10 years
- Diet
- Not applicable (sedge). Photosynthetic.
- Habitat
- Wetlands, swamps, damp grassland, stream banks and lake margins. Prefers moist, fertile soils with full sun to partial shade. Tolerates seasonal flooding and waterlogged soils.
- Range
- Throughout New Zealand from Northland to Stewart Island. Most common in wetlands, swamps and damp grassland. Widespread in lowland areas.
- Endemism
- Endemic
- Main Threats
- Habitat loss from wetland drainage is the primary threat. Water pollution and degradation. Climate change affecting wetland habitats.
- Population
- Populations are considered stable but localised. The species is common in wetlands throughout New Zealand. It is threatened by ongoing wetland drainage. Protection of wetlands is important.
- Conservation Status
- Not Threatened
A common sedge of New Zealand's wetlands. A plant that does not get noticed until it is gone.
It forms dense, upright clumps of bright green leaves. The leaves are long and narrow, arching slightly at the tips. The seed heads are dark brown, held on tall stalks above the leaves. The plant grows in wetlands, swamps, and damp grassland throughout the country. A plant that likes its feet wet.
The leaves are tough and fibrous, with a rough texture. The seed heads appear in summer and are followed by small seeds that are dispersed by wind and water. The plant provides important habitat for wetland birds and insects. The dense clumps offer shelter from predators and nesting sites for birds. A plant that builds homes for others.
Swamp sedge is one of the most common sedges in New Zealand's wetlands. It often grows alongside pukio and wīwī, forming mixed communities of rushes and sedges. The bright green leaves stand out against the darker foliage of other wetland plants. A plant that shines in the swamp.
The leaves were used by Māori for weaving floor coverings, baskets and fish traps. The tough, upright leaves were valued for their strength and durability. They were soaked to soften them before weaving. A plant that made the tools that caught the fish.
To find swamp sedge is to walk the margins of wetlands and streams. Look for the dense, upright clumps of bright green leaves, the dark brown seed heads. It is a plant of the wet places, a sedge of the swamp.
The swamp is wet. The sedge grows tall, bright green against the dark water. The birds nest in its clumps. The insects hide in its stems. The sedge does not ask for thanks.
It just grows. That is enough.