Leaves can not loose leaves. Your question is meaningless. Look in the related question below.
Deciduous trees loose there leaves each Autumn.
in the fall. most trees loose their leaves in the fall.
There is not much to do after you use your loose leaves. I suggest you should toss it out after using it because loose leaves usually looses its fragrance after using it.
In the Autumn.
They do loose their leaves eventually as the leaf grows old, dies and is replaced... BUT they do not loose their leaves all at once (in autumn/ fall) as deciduous trees do
decuios trees loose their leaves in the winter