Knotweed

Polygonum aviculare

Photo of Knotweed
Photo by Dr. John Meade, weed scientist emeritus
Rutgers NJAES Cooperative Extension

Knotweed is an early germinating member of the smartweed family. It normally shows up around mid-march and is often mistaken for a grass because of the long narrow cotyledons. It tolerates compacted soils and so is commonly found along sidewalks and paths as well as golf tees. Sometimes it is the only thing that will grow in heavy compacted soils. Associates well with goosegrass.

Additional Images


  1. Rutgers
  2. Executive Dean of Agriculture and Natural Resources
  3. School of Environmental and Biological Sciences