Flat-stem Spike-rush
Eleocharis compressa
Last reviewed: August 2026
Toxicity unknown
Flat-stem Spike-rush (Eleocharis compressa) 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.
The USDA PLANTS Database (opens in new tab) does not flag Flat-stem Spike-rush as toxic to livestock.
Light
full sun
Water
high
Size
4"–16" H × 2"–6" W
Bloom
May, Jun, Jul, Aug
Native to
AL, AR, CO, IA and 24 more states
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 445 programs across 44 states, each with a link to the provider and the date we last checked it.
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Flat-stem spike-rush is a low-growing native sedge that forms small clumps with distinctive flattened stems. This moisture-loving perennial produces small, inconspicuous flower spikes from late spring through summer and thrives in consistently wet conditions.
In an HOA neighborhood
Flat-stem Spike-rush takes more care to keep looking intentional in a front yard. Maintenance level: high. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Requires consistently wet conditions that may create drainage issues
- Very informal grass-like appearance may look weedy
- Small size and unremarkable appearance don't provide ornamental impact
Wildlife value
This sedge provides nesting material and cover for small birds and supports various insects, though it is not a significant pollinator plant.
Common questions
- How much sun does Flat-stem Spike-rush need?
- Flat-stem Spike-rush grows best in full sun conditions.
- When does Flat-stem Spike-rush bloom?
- Flat-stem Spike-rush blooms in May, June, July, and August.
- Where is Flat-stem Spike-rush native?
- Flat-stem Spike-rush (Eleocharis compressa) is native to AL, AR, CO, IA and 24 more states, per the World Checklist of Vascular Plants (Kew).
- Is Flat-stem Spike-rush toxic to livestock?
- The USDA PLANTS Database does not flag Flat-stem Spike-rush as toxic to livestock.
- Is Flat-stem Spike-rush HOA-friendly?
- Flat-stem Spike-rush 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 the World Checklist of Vascular Plants (Kew). Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Ready to grow Flat-stem Spike-rush? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
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