Quackgrass
In the words of the National Agricultural Library, the definition of invasive plants is…
“Invasive plants are introduced species that can thrive in areas beyond their natural range of dispersal. These plants are characteristically adaptable, aggressive, and have a high reproductive capacity. Their vigor combined with a lack of natural enemies often leads to outbreak populations.”
The above definition describes quackgrass perfectly. It is indigenous to Europe and covers most of North America (It is absent from the Gulf Coast States because quackgrass does not tolerate long, hot summers). This weed can become the dominant species very quickly and once established it is difficult to eradicate. 
Quackgrass invades the following places with ease:
Quackgrass is a cool season perennial that reproduces by seeds and rhizomes. It can grow up to 4 feet tall and thrives in well-drained soils with slightly acidic pH levels. Control of Quackgrass: Non-chemical controls include mechanically removing but getting to the underground portion of the rhizomes may be difficult. Chemical control can be done with nonselective herbicides when it is actively growing. |