Geez! I got this one, though. All things artificial and man-made laying rusted and broken, but the natural world of the garden inside cannot rust. So it was necessary that you come to a state of peace with nature, that you feel the grass and greet the sun, before returning to dust.
I'm not sure if you mean to say that you return to nature, or you are rejected by nature and turn to dust as you were an ash, which matches the desolate, "rusted" imagery you attributed to the world of man...
Real head-scratcher, but your talent is solid and you write with a skill I can only dream of someday developing. It'd be a tragedy not to include this in Reflections.
"Faith" means the will to avoid knowing what is true.
~ Friedrich Wilhelm Nietzsche