If it's dried first I think it would be fine--Free is good! I didn't mean that to come across poorly. I kept getting a visual of bunches of hatchling snakes coming out from where I dumped a couple bags of grass clipping when the lawn had gotten too long to use the mulching attachment last year. I'd had no idea a bag of grass clippings would get so hot and smelly and make such an apparently perfect place for snake eggs to incubate.