To dream of a leaves on the ground represents the results or consequences of a big change. Positively, you are dealing the results of a very positive change. Negatively, you may feel you have to deal with consequences of a loss.
To dream of leaves on a tree represents confidence that something is never going to change. Positively, you feel you can’t lose. Negatively, you fear something can’t fail ever again.
To dream of seeing a leaf represents your awareness of something in your life not doing what it used to be doing. A change has occurred.