Old Witchgrass, also known as Quackgrass, is a type of weed that is commonly found in North America. It is a persistent plant that spreads quickly and can be difficult to control. Besides the common name of Old Witchgrass, it is also known by several other names such as Couchgrass, Scutchgrass, and Devilgrass. It can also be referred to as Agropyron Repens, its scientific name. Additionally, it may be called Doggrass, Quickgrass, and Wheatgrass. These synonyms may be useful for those identifying and treating Old Witchgrass in landscaping or farming situations.