Conyza sumatrensis, commonly known as Guernsey fleabane, is an annual herb that is likely native to South America, though it has become widely naturalized in tropical and subtropical regions around the world. It typically grows to a height of 3 to 7 feet tall and features small white flowers with yellow centers that bloom in the summer and fall. The flowers give way to dandelion-like seed heads that facilitate wind dispersal. This species thrives in disturbed sites, including roadsides, urban waste areas, and agricultural land, where it often forms dense stands.

Guernsey fleabane is known for its rapid growth and ability to colonize disturbed sites quickly, which can be beneficial for erosion control or as a pioneer species in restoration projects. However, its invasive potential should be carefully considered before planting. In cultivation, it prefers full sun to part shade and can tolerate a range of soil types, provided they are well-drained. It has low water requirements once established, making it suitable for xeriscaping or low-maintenance gardens. Despite its invasive nature, it is sometimes used as an ornamental for its delicate flowers and feathery seed heads.CC BY-SA 4.0