The Hanging Gardens of Slarvia were beautiful gardens growing on rocks hanging in the air which were kept on Slarvia.
They were destroyed many centuries before the Ninth Doctor, Rose and Jack visited the Eye of Orion. They were covered in Slarvian vines, which were maroon.
Taggani used an Aesirian world-shaper helmet to recreate them on the Eye of Orion, but made the copy too green. (COMIC: Hacked)