Trees in dense populations prune themselves. Branches die from getting no light and fall off, and crowns strive towards the light, which gives a straight and clear trunk. To promote natural pruning and get tall trees quick growing species can be mixed in or manual pruning can be used.
The purpose of pruning is to promote clear trunks for production of high grade lumber. Pruning is done on young trees, 5-10 cm diameter at chest height. Do not make flush cuts or leave branch stubs.
Pine, oak, ash, birch and juniper are all suitable for pruning. Pruned juniper can be used as fencing or poles. Spruce is not a choice for pruning, being very vulnerable to rot.