Other than the obvious Mulberry trees?
Which tree is "best" for high q Boards, as in most logs? Also, which, regardless of how many logs it gives (you can just plant more trees) has the fastest rate of maturing?
Also, with the tree quality formula having a +2/-5 spread, can someone use math magic and tell me how many trees I should plant each generation to have a very high chance of getting at least one +2?