1. (noun) fat hen, Chenopodium album - a very common weed, especially in arable districts. Growing mainly in spring and summer, this erect weed can grow up to 2m tall. It is known as a very competitive weed due to its ability to remove moisture from the soil even in dry conditions. The grey-green leaves are up to 7cm long, sword shaped and have margins that appear toothed. Main stems and laterals often have green, yellowish or sometimes reddish ribs and can become quite hardy. Normally forms very small green flowers between December and May that develop into a tight cluster of seeds up to 30cm long. Seeds remain viable in the soil for long periods of time.