Usually we see lightsabers cutting through metals like butter, with a few notable exceptions. And we know it can cut through flesh while cauterizing the wound. But what about material with a different resistance to heat, like a wet log? Could a lightsaber cut a tree down with a slice or by just thrusting it into the wood, as trees don't really "melt"? What would the physics be of doing something like this?
Yes, several of the books describe Luke using his lightsaber to cut through jungles.
It also follows physics. A wet log doesn't burn easily, but an oxy-Acetylene torch will go through it in no time.