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Sesbania grandiflora is a leguminous tree of family Fabaceae. It is fast-growing and soft-wooded, and it grows to heights of 5–25 metres (16–82 feet). The leaves are regular and rounded, and grow to 15–30 cm (6–12 in) long, with leaflets in 10–20 pairs or more and an odd one. The flowers white, red or pink and are oblong, 1.5–10 cm (1–4 in) long in lax, with two to four flower racemes. The calyx is campanulate and shallowly two-lipped. The fruits, or seed pods, look like flat, long, thin green beans. They are slender, falcate or straight, and 30–45 cm (12–18 in) long, with a thick suture, and each contains approximately thirty 8 mm (0.3 in) seeds. The tree thrives under full exposure to sunshine and is extremely frost sensitive.