Crotalaria spectabilis, commonly known as Showy Rattlebox, is a perennial herb native to the Indian Subcontinent, southern China, and Southeast Asia. It thrives in open woodlands and montane grasslands within its native range. This species typically grows to a height of 2-5 feet and is recognized for its erect habit and bright yellow, pea-like flowers that bloom in summer. The flowers are followed by inflated, rattling seed pods that are characteristic of the genus. Showy Rattlebox is often used as a green manure crop due to its ability to fix nitrogen in the soil.

In cultivation, Showy Rattlebox is valued for its nitrogen-fixing properties and vibrant flowers. It is used in agriculture to improve soil fertility but has become an agricultural pest in some regions, where it is toxic to livestock, causing liver damage. It requires full sun to part shade, moderate water, and well-drained soils. While it can be a useful plant in its native range or under controlled conditions, it is frequently invasive when grown outside its native habitat and can outcompete native flora. Gardeners should be cautious and check local regulations before planting, as it may be considered invasive in their area.CC BY-SA 4.0