Types of pruning cuts: https://www.azplantlady.com/2010/02/three-neglected-peach-trees.html
Trimming oak trees: http://www.wikihow.com/Trim-Oak-Trees
Pruning trees in a desert: https://www.chandleraz.gov/Content/WC_PruningTreesDesert.pdf
http://www.ourcityforest.org/blog/2016/1/29/w4p4udrhn7mfyj7yuja0atvgjliqgy