In South Africa we have two species of Strelitzia growing. The first is one found in many other countries too and is also called "The bird of Paradise." It is a very slow grower and when first planted, takes a few years for the first blooms to appear. On average, it get to be about 3/4 feet in height and are propagated through breaking off shoots at the bottom with roots on. This flower is also found on one of our coins.
The second species grows to a height of 15-20 feet and is sometimes called the Giant Strelitzia with flowers about 4 times the size of the normal one.