Patrick Blanc looking at Dracaena cambodiana at the top of a karst tower, Halong Bay, Vietnam, Jan. 2007
Patrick Blanc in front of a vertical karst tower partly covered by Cycas tropophylla, Halong Bay, Vietnam, Jan. 2007
Patrick Blanc in a vast population of Dracaena cambodiana at the top of a karst tower, Halong Bay, Vietnam, Jan. 2007