Canna flaccida is a species of the Canna genus, a member of the family Cannaceae. The species is indigenous to the wetlands of the south-central and south-eastern United States from Texas to South Carolina. It is also reportedly naturalized in India, the Philippines, Mexico, Panama, Cuba, the Dominican Republic, Peru and southern Brazil.

Canna flaccida was a parent to many of the early-hybridised cannas originally known as orchid flowered cannas, but now correctly named as Italian Group cannas. It grows well as a water canna. Originally described by the early American explorer, William Bartram, when he found these plants blooming near the rivers of coastal Georgia. The seed floats down the rivers and becomes easily established on shorelines. 

Canna flaccidais a perennial growing to 1.5m. It is hardy to zone 10 and is frost tender. In the north latitudes it is in flower from August to October, and the seeds ripen in October. The flowers are hermaphrodite.