Hi
Try to find in google search " Kairyoen "
Japan nusery association is good place to ask.
mike

Do make sure you can't find a particular item here already before undertaking the expense and trouble of trying to get it in from Japan.

That is good idea.
About 60 % of plants sold in Nursery in USA came from Japan and China. To collect Japanese nusery catalogs, it will cost you too. most Japanese nursery cataolgs you have to pay.
If you are looking for free catalogs , yopu have to dig in realy deep.
Beside you are not responding to repaly. you are going to have difficult time to get help here too. ^^