To dream of waste indicates a movement away from the norm in your life. Your life as you have been living it may not be very fulfilling to you at this time, so much of your energy and true self is being laid to waste.
To utilize yourself to the fullest, a drastic emotional or physical change may be necessary. Note the type of waste - garden waste, human waste, food waste, etc. Each refers to an aspect of self that is being left behind. Do you need to make drastic changes to diet, living conditions, or your relationships?