Tall Flatsedge
Cyperus eragrostis
Also listed as Cyperus vegetus, Chlorocyperus eragrostis
Also known as Umbrella Sedge, Drain Flat-sedge, Pale Galingale
Climate Match for your location
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A tall sedge with slender, upright green leaves and delicate flower spikes that appear in summer. It thrives in wet or boggy conditions and is ideal for water gardens and rain gardens.
Why grow it
Tall flatsedge is a reliable native sedge for permanently wet sites where grasses struggle, offering fine texture and summer interest without the maintenance demands of ornamental rushes. Unlike many moisture-loving sedges, it tolerates standing water and seasonal flooding, making it useful for rain gardens and constructed wetlands where soil conditions fluctuate. Its slender habit and delicate inflorescences provide visual contrast to broader-leaved wetland plants.
Watch out for
This species can self-seed prolifically in ideal conditions, so deadheading or cutting before seed dispersal helps prevent unwanted spread beyond intended areas. In cooler climates, established plants may take a season or two to develop vigorous growth, and poorly drained winter soils can sometimes stress plantings in regions with prolonged freeze-thaw cycles.
Overview
- Form
- Growth Rate
- Size
- Dormancy
- Family
- Cyperaceae
Native to the United States
Native Range
South America
Native to: Alabama, California, Louisiana, Mississippi, New Jersey, Oregon, Pennsylvania, South Carolina, Texas, Washington
Seasonality
Bloom Season
Season of Interest
Herb
Soft non-woody plants of the field layer.
Succession Role
Tolerances & Soil
Establishment & Care
- Establishment
- Maintenance
- Propagation
A tall sedge with slender, upright green leaves and delicate flower spikes that appear in summer. It thrives in wet or boggy conditions and is ideal for water gardens and rain gardens.
Climate Match for your location
See how well Tall Flatsedge grows in your area.
Enter your ZIP code and we'll show you how this plant fits your local climate.
Why grow it
Tall flatsedge is a reliable native sedge for permanently wet sites where grasses struggle, offering fine texture and summer interest without the maintenance demands of ornamental rushes. Unlike many moisture-loving sedges, it tolerates standing water and seasonal flooding, making it useful for rain gardens and constructed wetlands where soil conditions fluctuate. Its slender habit and delicate inflorescences provide visual contrast to broader-leaved wetland plants.
Watch out for
This species can self-seed prolifically in ideal conditions, so deadheading or cutting before seed dispersal helps prevent unwanted spread beyond intended areas. In cooler climates, established plants may take a season or two to develop vigorous growth, and poorly drained winter soils can sometimes stress plantings in regions with prolonged freeze-thaw cycles.
Overview
- Form
- Growth Rate
- Size
- Dormancy
- Family
- Cyperaceae
Native to the United States
Native Range
South America
Native to: Alabama, California, Louisiana, Mississippi, New Jersey, Oregon, Pennsylvania, South Carolina, Texas, Washington
Seasonality
Bloom Season
Season of Interest
Herb
Soft non-woody plants of the field layer.
Succession Role
Tolerances & Soil
Establishment & Care
- Establishment
- Maintenance
- Propagation
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