Artificial establishment is what most people are familiar with.
This method is used where natural regeneration is not adequately established. The treatments involved include site clearing, remnant removal, site preparation, planting, and chemical and manual weeding. Natural establishment may be as simple as doing a complete harvest in an overmature stand with a foot or more of snow on the ground to protect the new crop that is already established on the forest floor. More commonly, this method involves a series of partial cuts carried out over a period of 5 to 15 years to encourage or enhance establishment of natural regeneration. This treatment is referred to as a shelterwood.