Rotting Wood is used for isopods, millepedes and cockroaches. It is a crucial food source and substrate for many millipede species, especially detritivores, and is often used in their enclosures to mimic their natural habitat and provide a long-term food supply. Every bag has been through a deep freeze process and is ready for use upon opening. For peace of mind, you can also place the bag of rotting wood in your freezer for 72 hours before use.