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Illinois Native Plant Guide - Blunt Spike Rush - Pages 74-75

Illinois Native Plant Guide

Blunt Spike Rush
Eleocharis obtusa

Preferred Water Depth and Inundation Tolerance

Mudflat species. Needs saturated soil. Species tolerates inundation to a depth of 6 inches.

Wildlife Value

Rhizomes and achenes are eaten by waterfowl. Also provides food for rails, muskrat, and rabbit.


Used in upper shoreline zones, for streambank stabilization, and in vegetated swales.

Availability, Establishment, and Maintenance

  • Annual. Spreads by seed where there is no competition.
  • Requires drawdown for seeds to germinate.

Blunt Spike Rush
Eleocharis obtusa

Mature Height
12-18 inchesBlunt Spike Rush

Plant Type
Annual tufted herb

Indicator Status

Not available

Nutrient Load Tolerance
Moderate to high

Salt Tolerance
Low to moderate

Siltation Tolerance

Flowering Color and Time
June to October

Light Preference
Full sun

Seeding Rate
.02 - .4 lbs/acre

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