Quassia amara, commonly known as Amargo or Bitter-wood, is an evergreen shrub or small tree native to the rainforests and secondary forests of Central and South America. It typically grows to a height of 10-20 feet (3-6 meters) with a similar spread. Quassia amara has a distinctive appearance with its compound pinnate leaves and clusters of bright red flowers that bloom throughout the year, attracting hummingbirds which are the primary pollinators. The flowers are quite showy, making it an attractive ornamental plant.

Quassia amara is valued for its medicinal properties, particularly the bitter compound quassin found in its wood, which has been used as an insecticide and in traditional medicine for its purported digestive and anti-parasitic benefits. It is also used as a food additive due to its bitter flavor. In cultivation, Amargo thrives in moist, well-drained soils and prefers partial shade to full sun conditions. It is relatively easy to maintain and can be used in tropical gardens for its ornamental flowers and as a natural insect repellent. However, gardeners should be aware that it may require protection from frost in cooler climates. While not commonly reported as invasive, it should be monitored when grown outside its native range to ensure it does not become problematic.CC BY-SA 4.0