Rockin' Jaw Rabbit worm castings are a very good organic additive to your garden soil and potted plants. They are non-toxic, non-burning, and have a very pleasant scent of fresh turned earth. 100% pure rabbit manure worm castings are created by the happy rabbits and redworms at Rockin' Jaw Rabbits. There are no additives of any kind. Castings can be used to side-dress around plants, or blend with potting mix (one-part castings to three parts potting mix) to help your plants thrive.