Re: Harvesting wild mosses and plants. Bringing in unwanted pests.
No plants out of the wild should be harvested. Period. That implies collecting way more than you'd need for yourself. Leave the material where you found it.
Collecting a small amount for yourself - and placing it in a grow out area for an extended period? Safer. A tad more sustainable as well.
I've read about mountainsides that have, literally, had their moss rolled up and "harvested". That disgusts me.