Hello Jardinerowa, They have been known to be available in Australia via some people who have contacts in the Hawaiian Botanical Gardens. I will see if they still have some seed, otherwise contact the Bot gardens and see what they can do. This plant is growing in Australia, so what about getting some wood from it and growing it on?
Try asking this question on the International Hibiscus Society website and others may be able to help as well.
Regards, Brian Kerr.

Brian,

Thanks for the message and the tips. I will try to contact the Hawaiian Botanical Gardens. I've seen the Hibiscus arnottianus for sale somewhere online but it doesn't say it's ssp. immaculatus.

J

i would like to buy a cutting if someone has one

Hello everyone! Please help me out. I'm from India and I want to grow this fragrant hibiscus here as it is unique. Could anyone please send me the seeds? Please reach me at debarghya2010@gmail.com. Thanks a ton!

I am also in search of this plant for a long time