Research involving Hovenia dulcis. Anyone know where to find it?

Hello, all - I'm conducting some independent research on Hovenia dulcis extracts, and I was wondering if anyone might clue me into a place to inquire about a fresh plant sample. As of now, I've only been able to locate dried commercial product online, and I suspect fresh cuttings/leaves/etc would provide much more reliable results in my analyses.

So... does anyone know who I might inquire for a fresh sample?

Thanks!

 

Try botanical gardens and arboreta.