The type purchased here is very dusty, but all fiberous dust can be dangerous and cause infections. I was not expecting that much dust the first time and developed "bronchitis" rapidly. No problem, I have had problems with it for years (Bronchitis, Asthma, Pneumonia or what ever they want to call it that day). Now I either wear a mask, avert my face or hold my breath while removing LFS from the bag and getting it into water. Luckily my bog is starting to produce live sphagnum and I hope to have a enough to work with in a couple of years. I have not tried it with my bonsai. I am going to have to though.