This is Strelitzia juncea, also known as Narrow-Leaved Bird of Paradise. This is probably the most frost resistant of all the bird of paradise plants. They have some of the most interesting blossoms found anywhere. It is popular with the birds, bees, and butterflies and is also able to spend winters indoors. This gorgeous plant likes to live in full sun to partial shade and can sometimes get as high as 6 feet tall. USDA Hardiness Zones 9b to 11