Two questions.
Is that from the Alabama Statute?
Does that make anything put on a grave "litter"?
“Is that from the Alabama Statute?”
Yes.
“Does that make anything put on a grave “litter”?”
No. It is a definition in the littering statute and applies only to:
Criminal Littering
(1) Knowingly deposits in any manner litter on any public or private property or in any public or private waters, having no permission to do so.