High Cellulitic material that is low in nutrients like grass are more difficult to break down naturally. That's why a cow needs 4 stomachs and jews all day. For the same reason black soldier fly will have a hard time breaking down grass clippings.
From my experience, I would not intentionally inundate a colony with grass clippings and/or wood chips. Nature provides us with other creatures that are better equipped for the job... termites and certain ants that secrete highly digestive enzymes.
However, I would love to come up with a way cultivate other insects as easy as it is to raise black soldier flies.
