River bulrush, Scirpus fluviatilis Seedling leaf has parallel veins and a shiny surface stem is triangular in cross section leaves emerge opposite in one plane later leaves are slender, flat, with prominent midrib young plant arises from a tuber Mature plant grows 3 to 5 feet high stems have several slender, tapering, alternate leaves flower head has several egg-shaped flower clusters with pointed tips rhizomes form dark brown, very hard tubers Management Freezing kills the tubers Deep plow field to a depth of 8 to 12 inches and follow with a rotation to a nonirrigated crop or to fallow Difficult to control with herbicides

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Modified: 11 Sep 1997 Comments to jayoung@ucdavis.edu