That took many years. And as far as I am aware that would be the exception in the history of modern reforestation. The needs of industry and government (which

That took many years. And as far as I am aware that would be the exception in the history of modern reforestation. The needs of industry and government (which is what you’re targeting if you want to replace construction materials) are optimizing for speed to grow (and hit arbitrary targets), and suitable properties for building, and generally that means they pick a very limited selection of trees that grow fast, sometimes as few as one type of tree.