Ageratum conyzoides, commonly known as billygoat-weed, is a perennial herb that is native to tropical grasslands and open forests in Central and South America. It can grow up to 3 feet tall and is characterized by its hairy leaves and clusters of small, fluffy flowers that range in color from white to mauve. The flowering season extends from late spring to autumn, and the flowers are quite showy, attracting various pollinators. In its native habitat, billygoat-weed thrives in areas with disturbed soil, often colonizing areas along roadsides and cleared land.

Billygoat-weed is known for its rapid growth and ability to spread, which can be beneficial for quickly covering bare areas in a garden. However, due to its invasive nature, it is not recommended for cultivation outside of its native range. It prefers full sun to part shade and grows well in a variety of soil types, provided they are well-drained. While it is drought-tolerant once established, it benefits from regular watering during prolonged dry periods. Gardeners should be cautious, as it can become a weed problem due to its prolific seed production and potential to outcompete native plants.CC BY-SA 4.0