Hoya sp. Phu Wua has been kicking around the world of Hoyas now for around five years.  The flowers are very similar to Hoya caudata and Hoya flagellata but the plant seems to be far easier to grow than either of those two plants.  I think that Hoya sp. Phu Wua is a good way to start working your way up to those far more demanding plants and is equally as rewarding to flower.  I give Hoya sp. Phu Wua my highest recommendation!