Direct seeding, an attractive alternative to planting, is not a simple method of forestation. Past experiences show far more failures than successes. Well documented procedures must be followed to insure any degree of success. In general, conifers have given the best results. Black walnut and black locust are notable exceptions. Current research suggests that other hardwoods may be successfully direct-seeded.
Davidson, Walter H. 1980. Direct seeding for forestation. In: Trees for Reclamation Symposium Proceedings; Gen. Tech. Rep. NE-61. Broomall, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 93-97