Flatleaf Flatsedge
Cyperus planifolius
Last reviewed: June 2026
Toxicity unknown
Flatleaf Flatsedge (Cyperus planifolius) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.
Light
part sun
Water
medium
Size
12"–24" H × 6"–12" W
Bloom
N/A
Native to
FL, GA
Before you buy
Your city may pay you to plant this
Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 452 programs across 44 states, each with a link to the provider and the date we last checked it.
Find rebates in your areaBrowse plants for this ecoregion
Flatleaf flatsedge is a compact native sedge that forms small clumps of narrow, grass-like foliage. This low-growing perennial works well as a groundcover or accent plant in partially sunny areas with average moisture.
In an HOA neighborhood
Flatleaf Flatsedge takes more care to keep looking intentional in a front yard. Maintenance level: low. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Sedges often appear weedy to conventional landscaping standards
- May be confused with undesirable grass species
- Lacks obvious ornamental flowers or striking appearance
Wildlife value
This sedge provides habitat and food sources for various insects and small wildlife. The seeds may attract birds, though specific pollinator information is limited.
Common questions
- How much sun does Flatleaf Flatsedge need?
- Flatleaf Flatsedge grows best in part sun conditions.
- Where is Flatleaf Flatsedge native?
- Flatleaf Flatsedge (Cyperus planifolius) is native to FL, GA, per vouchered herbarium specimen records and regional native plant society lists.
- Is Flatleaf Flatsedge HOA-friendly?
- Flatleaf Flatsedge takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.
Native range data from vouchered herbarium specimen records and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
If something looks wrong
Common plant problems, and what to check first
These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.
- It is dying right after planting
- Leaves turning yellow
- Wilting even though I watered it
- Brown crispy leaf tips
- Bugs on the plant
Ready to grow Flatleaf Flatsedge? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
Planning a bed around it? Start a free plan with this plant
Not sure where to start? Take the 2-minute yard quiz