Lonas annua, also known as common ageratum, is a flowering plant commonly used in gardens and landscaping. Synonyms for the plant include Ageratum conyzoides, Eupatorium coelestinum, and Conyza annua. The name "ageratum" comes from the Greek words "ageratos" meaning "ageless," referring to the long-lasting qualities of the plant's flowers. It is also known as "blue mink" because of its fuzzy, blue-colored flowers. In traditional medicine, lonas annua has been used to treat fever, respiratory infections, and inflammation. The plant is easy to grow and attract pollinators such as butterflies and bees, making it a popular choice for gardeners.