Make sectional trees.
Like, there is stump brick, a trunk brick, and then a couple different tree top bricks.
That way we can make a forest with a range of tree sizes.
Place a tree top by itself and its short tree, place on a stump its a medium tree, place on a trunk on a stump and its a tall tree, place on a trunk on a trunk on a stump and its a really tall tree, etc.