Go ahead and use them Wolf. Just don't forget to soak and rinse them first before using. They may not contain salt as the commercially available have, but they contain tannin. I am not sure if tannin is harmful to the plants but its better to play safe. I'm also using coconut husks and shell chips collected from the coconut vendor at the market and I always soak and rinse them first. So far I don't have any problem yet.