grassN. America Native

Squarrose Sedge

Carex squarrosa

The Story

Plant Bio

Carex squarrosa is a clump-forming perennial grass-like plant native to wet meadows, floodplains, and bottomland forests of central and eastern North America. It forms dense tussocks of narrow, medium green foliage topped by sharp, triangular stems.

This species is distinguished by its thimble-shaped, bristly seedheads with strongly recurved perigynia that create a star-like appearance. The decorative fruiting spikes persist into summer while supplying valuable seeds and cover for wetland birds.

Uses & Benefits:

Produces distinctive, star-like thimble seedheads above neat tussocks of linear foliage.

Stabilizes wet soils and manages runoff along rain garden and stream margins.

Provides seed forage and shelter for waterfowl, songbirds, and wetland invertebrates.

Essentials

At a Glance

Plant Type

Grass

Height

24"

Width

18"

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8

Water

High

Humidity

High

Lifespan

Perennial

Native To

North America

Toxicity

Non-toxic

Bloom period

Late spring – Summer

In flower about 4 months of the year

Planting

How to Grow

Select a planting site in full sun or partial shade that stays reliably wet or saturated.
Work organic matter into lighter soils to enhance moisture retention before planting.
Set plugs or container crowns level with the existing soil surface and press firm.
Keep soil continuously moist or wet, supplying water during extended summer dry periods.

Pro Tip

Amateurs often treat sedges like drought-tolerant ornamentals, but Carex squarrosa demands consistently wet or moist soil and will scorch or die back if subjected to dry spells.

Keep It Thriving

Care Guide

Do

Maintain high soil moisture levels year-round.
Plant along rain gardens, stream banks, or bog margins.
Trim old dead foliage back in late winter before spring growth begins.

Don't

Do not allow the soil to dry out around the root zone.
Do not cut heavily into live evergreen crown tissue in summer.
Do not over-fertilize, which causes weak and floppy leaves.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Divide
Pest Check
Plant
Spring Cleanup

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Rain GardensPond MarginsBog GardensWetland Restoration

Companion Plants

Iris versicolor Lobelia cardinalis Caltha palustris Chelone glabra

Multiply

Propagation Methods

Good to Know

Common Questions

Squarrose Sedge questions

What zones can Squarrose Sedge grow in?

Squarrose Sedge is hardy in USDA Zones 4–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Squarrose Sedge deer resistant?

Yes — Squarrose Sedge is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Squarrose Sedge bloom?

Squarrose Sedge typically blooms in late spring through summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Squarrose Sedge need full sun?

Squarrose Sedge does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.