Probably killed by watering. You need to allow the tree to form a scar before watering it. Just assure that it is balanced and can sustain its own weight using

Probably killed by watering. You need to allow the tree to form a scar before watering it. Just assure that it is balanced and can sustain its own weight using some strong cables or any other support. Those trees can be heavy. And then forget that is there for some weeks. After this time you can start adding water. How much you can wait for watering depends on how harsh is your climate, but the golden rule is to use only the strictly necessary amount of water so the trunk does not shrink. The tree will feed on its reserves for a while and will discard all older leaves to form roots. You will have a lot of yellow leaves in the soil but don't worry, It will recover later from buds. As long as the trunk feels firm and does not show shrinks, the tree is alive. Take in mind that Yucca has a burrowing beetle parasite that can kill them.