In 1 ABY an adventurer fed the creature with Lokian weed. Gargle only liked a special kind of weed, so the adventurer had to collect and try different plants to find the one Gargle preferred.
Behind the scenes
Gargle was a Non-Player Character (NPC) in Sony Online Entertainment's MMORPG Star Wars Galaxies. It was added with the Chapter 16: Stronghold of the Lok Revenants update in March 2010. Star Wars Galaxies was shut down on December 15, 2011.
The kusak was part of the Caring for the Kusaks collection. Each time a player finished the Weed Whacker Foliage Requisition quest, the player was rewarded with one of ten different kinds of Lokian weed. These could be used to feed the kusaks, but each of the ten different kusaks in or near the stronghold only accepted one randomly determined kind of weed.