North America Native Plant

Withering Flatsedge

Botanical name: Cyperus fugax

USDA symbol: CYFU9

Life cycle: annual

Habit: grass

Native status: Native to the lower 48 states  

Withering Flatsedge: A Little-Known Texas Native If you’ve never heard of withering flatsedge (Cyperus fugax), you’re definitely not alone! This small, annual sedge is one of those quiet natives that tends to fly under the radar in the gardening world. While it may not be destined for your prize flower ...

Withering Flatsedge: A Little-Known Texas Native

If you’ve never heard of withering flatsedge (Cyperus fugax), you’re definitely not alone! This small, annual sedge is one of those quiet natives that tends to fly under the radar in the gardening world. While it may not be destined for your prize flower border, this unassuming grass-like plant has its own story to tell in the world of native Texas flora.

What Exactly Is Withering Flatsedge?

Withering flatsedge belongs to the sedge family (Cyperaceae), making it a grass-like plant rather than a true grass. As its common name suggests, this annual plant has a somewhat ephemeral nature, completing its entire life cycle within a single growing season. Don’t let the withering part of its name fool you into thinking it’s always droopy – that’s just referring to how it naturally dies back each year.

Like other sedges, Cyperus fugax has that characteristic triangular stem that distinguishes it from true grasses. It’s a native species to the United States, specifically calling Texas home, though it may occur in other southwestern regions as well.

Where Does It Grow?

This little sedge is a true Texan, with its known distribution limited to the Lone Star State. Within Texas, it likely occupies specialized habitats where conditions are just right for its particular needs.

Should You Plant Withering Flatsedge?

Here’s where things get a bit tricky – and honest. Withering flatsedge isn’t exactly what you’d call a garden center darling. In fact, you’d be hard-pressed to find it for sale anywhere. This isn’t because there’s anything wrong with it, but rather because:

  • It offers minimal ornamental appeal compared to showier native alternatives
  • As an annual, it requires replanting each year
  • Very little is known about its cultivation requirements
  • It likely has very specific habitat needs that are difficult to replicate in typical garden settings

If you’re looking to support Texas native plants in your landscape, you might want to consider other native sedges or grass-like plants that are better understood and more readily available, such as Texas sedge (Carex texensis) or various native bunch grasses.

Growing Conditions and Care

Given the limited information available about cultivating Cyperus fugax, any growing advice comes with a big asterisk. Based on its classification as a sedge and its Texas origins, it likely prefers:

  • Moist to wet soils (many sedges are associated with wetland or marshy areas)
  • Full sun to partial shade
  • USDA hardiness zones 8-10, consistent with its Texas distribution
  • Minimal fertilization, as most natives prefer lean soils

Since it’s an annual, any successful plantings would need to reseed naturally or be replanted each growing season.

The Bottom Line

While withering flatsedge may not win any beauty contests or become the star of your native plant garden, it serves as a reminder that our native plant communities include many modest species that play important ecological roles, even if we don’t fully understand them yet. Sometimes the most interesting plants are the ones that remain mysterious!

For gardeners passionate about Texas natives, focusing on better-known and more available species will likely give you more success and satisfaction. But if you’re a plant detective who loves a challenge, keep an eye out for this elusive little sedge in its natural Texas habitat – just remember to observe and appreciate rather than disturb.

Withering Flatsedge

Classification

Group

Monocot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Liliopsida - Monocotyledons

Subclass

Commelinidae

Order

Cyperales

Family

Cyperaceae Juss. - Sedge family

Genus

Cyperus L. - flatsedge

Species

Cyperus fugax Liebm. - withering flatsedge

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA