Johnson grass is a serious pest in many parts of the state. Normally thought of as a southern plant it is present as far north as Warren County. An actively moving plant by virtue of rhizomes it will keep moving through a field until controlled. It grows to a height of about 10 feet and has a large seedhead similar to sudan grass.
![Photo of Johnson Grass](images/large/johnsongrass-full.jpg)
Photo by Dr. John Meade, weed scientist emeritus
Rutgers NJAES Cooperative Extension
![Photo of Leaf of Johnson Grass](images/large/johnsongrass-midrib-full.jpg)
Photo by Dr. John Meade, weed scientist emeritus
Rutgers NJAES Cooperative Extension
![Photo of Johnson Grass in Corn](images/large/johnsongrass-incorn-full.jpg)
Photo by Dr. John Meade, weed scientist emeritus
Rutgers NJAES Cooperative Extension