torjusg said:It depends on how long they have been on the ground. It is very unlikely that a tree that has been laying dead for years will snap back.
I don't do it on trees that are still green.
Not always the case either. My brother sawed a groove in his knee cap with a chainsaw when a downed tree sprung after he'd sawn half way through it. Tree had been blown over (but was still three feet off the ground) for five years.