While the area of natural stands with large old trees is rapidly decreasing , large areas of new trees exist . It is increasingly grown in plantations where the long , straight , fast growing trunks are more valuable than the old growth timber . While the area of natural stands with large old trees is rapidly decreasing , substantial areas of regrowth exist and it is increasingly grown in plantations , the long , straight , fast growing trunks being much more commercially valuable than the old growth timber .