Commonly known as cockspur, millet or water grass
A common annual grass found throughout Idaho that can grow up to 5 feet tall. A non-native plant introduced in the mid-nineteenth century from Europe. Often found within or near crops, it can spread very easily via drift, machinery, birds or other animals. It has often been considered one of the world’s worst weeds because of the invasiveness of the croplands as it can out-compete desirable crops for necessary nutrients. Barnyardgrass can survive in a variety of conditions. It can thrive in moist, fertile ground but can do well in drier, cultivated fields. The stems may be erect or laying on the ground. The flowers and upper parts of the stems are often a reddish color. Barnyardgrass can be controlled with pre-emergent applications and post-emergent selective herbicides.