Ambrosia artemisiifolia, commonly known as common ragweed, is a flowering plant native to North America. It typically grows in disturbed areas, such as roadsides and fields, and can reach heights of up to 1.5 meters. The plant features jagged, green leaves and produces small, greenish-yellow flowers that bloom in late summer and fall. Common ragweed is notorious for its pollen, which is a significant allergen for many people, contributing to seasonal allergies known as hay fever. The plant can spread rapidly and is considered invasive in some regions, impacting local ecosystems and agriculture.