Ageratum houstonianum, commonly known as floss flower, is a flowering plant native to Central America and parts of South America. It belongs to the Asteraceae family and is recognized for its fluffy, blue to purple flowers that bloom from summer to fall. The plant typically grows 12 to 24 inches tall and prefers well-drained soil and full sun to partial shade. This perennial plant is often used in gardens and landscapes for its vibrant color and ability to attract pollinators like bees and butterflies. It is also popular in container gardening and as a border plant. However, it can be invasive in some regions, so careful management is recommended.