Senna hirsuta, commonly known as woolly senna, is a semi-deciduous shrub or herbaceous perennial native to tropical regions of Tropical and sub-Tropical America. It has naturalized in various parts of the world, including Africa, South Asia, Southeast Asia, and Queensland, Australia. Woolly senna typically reaches up to 8 feet 2 inches in height and is characterized by its pinnate leaves covered in fine hairs, giving it a woolly texture. The plant produces bright yellow flowers that bloom in clusters, mainly during the warm season, which are moderately showy and attract pollinators. The resulting seed pods are flattened and cylindrical, containing several seeds.

Woolly senna is valued for its rapid growth and adaptability to a range of soil types, although it prefers well-drained soils. It is drought-tolerant once established and thrives in full sun to partial shade. In cultivation, it is used for its ornamental foliage and flowers, often in borders or as a specimen plant. However, gardeners should be cautious as Senna hirsuta can become invasive outside its native range, spreading aggressively in suitable climates. It is also used medicinally in some cultures, although care must be taken due to the presence of compounds that can be toxic if ingested in large quantities.CC BY-SA 4.0