Literature on tree crown management, including topping and branch pruning, is reviewed to provide information to foresters who are managing conifer seed orchards. The production of short, wide tree crowns facilitates cone harvesting, supplemental mass or controlled pollination, and the control of insects and diseases. However, the changes in tree architecture can also cause problems that result in self pollination and vulnerability to physical damage. Key words: topping, pruning, apical control, pollination, cone collection, seed production, seed orchard