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Twoflowered Rush

Juncus biglumis

Last reviewed: June 2026

Twoflowered Rush (Juncus biglumis)
Photo: Denchev TT, Knudsen H, Denchev CM (2020) The smut fungi of Greenland. MycoKeys 64: 1-164. https://doi.org/10.3897/mycokeys.64.47380 / Wikimedia Commons (CC BY 4.0)

The USDA PLANTS Database (opens in new tab) does not flag Twoflowered Rush as toxic to livestock.

Light

full sun

Water

medium

Size

2"–8" H × 1"–4" W

Bloom

Jun, Jul, Aug

Native to

CO, MT, NM, WY

Twoflowered rush is a compact alpine perennial that forms small, neat clumps of grass-like foliage. This diminutive rush produces tiny flowers during summer months and maintains a tidy, low-growing habit perfect for rock gardens or alpine plantings.

In an HOA neighborhood

Twoflowered Rush 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.

  • Extremely small size makes it nearly invisible in typical landscapes
  • Alpine nature means it may not thrive in typical yard conditions
  • Grass-like appearance could be mistaken for weeds

Wildlife value

As a native rush species, it provides habitat and nesting material for small birds and beneficial insects. The seeds may attract finches and other small seed-eating birds.

Common questions

How much sun does Twoflowered Rush need?
Twoflowered Rush grows best in full sun conditions.
When does Twoflowered Rush bloom?
Twoflowered Rush blooms in June, July, and August.
Where is Twoflowered Rush native?
Twoflowered Rush (Juncus biglumis) is native to CO, MT, NM, WY, per the USDA PLANTS Database and regional native plant society lists.
Is Twoflowered Rush toxic to livestock?
The USDA PLANTS Database does not flag Twoflowered Rush as toxic to livestock.
Is Twoflowered Rush HOA-friendly?
Twoflowered 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 USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

Ready to grow Twoflowered Rush? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.

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