The thing with trees is they are also "wet". Cut a tree down and try to burn it in your fireplace or fire pit.its not gonna burn too good if at all.itll just sit there smoldering and sizzling while you watch it push the water/sap out the ends. Let it sit for a year and dry out,itll burn. Thats why fire wood is seasoned or kiln dried.

But the leaves and small branches should burn off them.

Houses are built with kiln dried lumber. The older the house,the drier the wood is.an old house will burn hotter and faster than a new house.