A Yucca tree is a decoration item that became available as a 15,000 point reward option for Phase II of Spring Cleaning 2008 in Publish 53. It is also commonly seen is arid, desert regions of Sosaria.
It has no appreciable use other than it's pleasant appearance and is often seen in player-owned homes inspiring a desert decor theme.
In the real world, Yucca is a perennial plant found in the American Southwest and Central America and member of the agave family of trees well known in the production of tequila. Yucca has the lowest ignition temperature of any wood.