Drooping leaves can be caused by drought, and it can also be caused by a medium saturated with too much water. In your tree's case it is from a saturated soil. Your tree's drooping is actually caused by a lack of soil oxygen which was driven out by the saturated situation.. Without available oxygen roots cannot absorb water even though it is in ample supply. Planting the tree as is, will not cure the problem. It should be corrected. Removing all of the medium, could cause still more trouble for the tree if not done very carefully , depending on how tightly the roots are held by the present soil. - Millet