You will likely have to do some trials on your own. There is a huge range of genetic material out there, and if you are able to find plants whose heritage is from Japan, rather than Korea or Russia, you will probably be better off. First start as Daisy says, and be sure to choose two cultivars that bloom at the same time. There many are whose bloom time will not overlap sufficiently, and you won't get good cross pollination. When I started growing them in the late 1990s, there was little information known about this, but now it should be easy to ferret out. Here in the north, Honeyberries can be invasive, but down where you are that won't be a problem.
