Additional Info
This is an incredibly rare decoration, to the point that I have not personally ever seen one in-game, but it does seem to exist. Players report that it drops from the two world bosses on Ossus.
In this thread, a player states: it’s a Drop item….. it *May* be in all the drop tables, but AFAIK it has only been seen dropping from Swarm Lord, and pretty rarely at that….. there’s 2 others that are known to drop from him that are also absurdly rare. Another player in this thread states: Currently, they only drop (very, very rarely) from the Ossus World Bosses and they are Bind on Pickup. The whole issue could be avoided if they were not BIP, so at least consider changing that, please!
A player named Roksik in 2019 posted actual screenshots on TOR Decorating and stated they “Got it from the bug WB!!”
So I can only assume it does actually exist, it’s just very, very rare. It’s matching rare-drop counterpart seems to be the Irrigated Garden.
Here is the archived information about this decoration from TOR Decorating: