Costus plicatus is a beautiful plant, and I have never seen it in cultivation. I found it in Costa Rica in 2011 at the La Gamba Research Station and collected seeds. The plants are now finally large enough to ship and should flower in a year or two at the most.
Costus plicatus has very broad and beautiful plicate (pleated) leaves that shimmer n the sunlight. The plant grows to about 6-7 feet tall. The inflorescence is a red cone, much like C. nitidus, with a yellow tubular flower.
Hardiness is untested but expected to be only zone 10 hardy so it must be grown indoors in winter in colder climates.