Yes, it can do tree generation, from scratch. Although, to be honest, the tree/plant creator area looks scary...lot of numbers etc I'm not a math wizard by any stretch of the imagination :( I have managed to replace leaves on the supplied trees & there are LOTS of options... I guess I'd take the Bryce tree editor and magnify it by 10, that is for existing trees. I should note here the tree aren;t saggy/droopy. Hope this helps :)