Datura Discolor has large flowers (170 mm in diameter). The flowers are very short-lived and blossom for only one night and wither the following day. However the plant produces numerous blooms...
A very beautiful, very interesting looking plant. Frilly, double, midnight-purple fluted horns or trumpet flowers, with white interiors burst open in profusion throughout the Summer.
In general, Heliconias are evergreen in the Tropics and warm Subtropics, like zone 10. Further north, upper zone 9 and lower zone 8, they may be frozen back to the ground each Winter but survive to resprout the next Spring.