According to Official Guinness Records,
The largest vertical garden measures 2,593.77 m² (27,919 ft²) and was achieved by Cleanaway Company Limited and Shine Green Energy Enterprise Co., Ltd. (both Chinese Taipei) in Kaohsiung, Chinese Taipei on 29 June 2015.Cleanaway and Shine Green Energy both specialise in sustainable waste disposal and green energy. The vertical garden helps to camouflage a landfill site into the surrounding countryside.
For a complete list of 2015 records, please visit 2015 Guinness Records in Taiwan.