There is more to Costaceae than just Costus. The genus Dimerocostus includes just two species, both of which are from the Americas. Here I am offering the white flowering form of Dimerocostus strobilaceus. There is also a yellow flowering form of the same species that I am offering on a separate listing. I have seen this white flowering form in Panama, Colombia, Ecuador and Peru - and I believe it is actually more common than the yellow form that is often found in cultivation.
This is a tall plant, growing to 10 feet tall in a large pot. The foliage spirals around the stems much like Costus, but the leaves tend to be closer together and the plant has more of a woody look to it. It usually has a distinct red midstripe on the leaves. The white flowers are quite showy and bloom almost non-stop once the plant has matured. I have been told this species is technically a lateral bloomer as the flowers form around the stem and the stem can continue to grow right through the inflorescence.
Dimerocostus are frost tender and must be grown in a greenhouse over winter except in Zone 10. They need moist, rich organic soil like most Costus, and will flower best in a sunny area, can be grown in full sun if kept moist.