The bauhinia is the emblem of Hong Kong. The Forever Blooming Bauhinia Sculpture that gives the Expo Promenade the commonly-used name, Golden Bauhinia Square, was a gift from the Central Government to mark the 1997 Handover -- an occasion that held tremendous significance for the world’s largest nation and that stands out as a landmark event in 20th century history.
Source: http://www.discoverhongkong.com/