University of Missouri Extension

IPM1007, Revised November 2009

Practical Weed Science for the Field Scout: Corn and Soybean

Smartweed, swamp (Polygonum coccineum)

Perennial broadleaf

Smartweed, swamp
 

Smartweed, swampAn erect perennial from rhizomes. It typically occurs in low, wet areas of no-till crop fields but also in ditches or along the shorelines of ponds and marshes. Plants may reach as much as 3 feet in height. Leaves occur alternately along the unbranched stems and are oval to lanceolate in outline and are up to 2-1/2 inches wide with wavy margins that taper to a point. A membranous sheath called an ochrea surrounds the stem at the base of each leaf. Flowers are pink to rose-colored and occur as 1- to 3-inch spikes at the ends of stems.
 

Smartweed, swamp
 

IPM1007, revised November 2009

Wild thing
 

IPM1007 Practical Weed Science for the Field Scout: Corn and Soybean | University of Missouri Extension

Order publications online at http://extension.missouri.edu/explore/shop/ or call toll-free 800-292-0969.

University of Missouri Extension - print indicia