While you can burn most woods, I would pass on the arborvitae. As an evergreen, you will get a LOT of creosote, fast burning, short lasting fires. It also contains a toxin believed to be a hallucinogen. A small amount used as kindling may not be a problem.
yes, the oils in the wood make it burn very quickly, the wood will not last long, and you should be sure to clean your chimney regularly, but the wood burns quite well
No, it is not safe to burn wood in a gas fireplace with a chimney designed for gas.
no
Check with Martin for an owner's manual. Unless a fireplace is specifically rated as multi-fuel, a gas fireplace cannot safely burn wood.
No, it is not safe to burn. It is toxic.
yes you can burn cactuse
You really should not burn ANY solid fuel in a gas fireplace.
I do.
Yes.
quite good to burn indeed!
Yes.
Its wood isn't it