The IHS maintains the Official ICRA Nomenclature database of all registered hibiscus rosa-sinensis.
The latest edition of "Hibiscus International", the quarterly news magazine of the International Hibiscus Society.
The International Hibiscus Society holds occasional seed auctions on EBay. Watch for further information.
The IHS runs two major competitions each year: SOTY (Seedling of the Year) & HOTY (Hibiscus of the Year).
The IHS maintains a Facebook page open to hibiscus enthusiasts worldwide.