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H Trees should only be pruned (修剪) when there is a good and clear reason for doing so and, fortunat...

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to helps a wound to dry  to covers a rough surface  damages some of the small side branches  allows too many branches to grow in the middle  
Because it can make trees grow taller.  Because it can improve the shape of the trees.  Because it can get rid of the small ranches.  Because it can make the small branches thicker.  

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