On ornamental plants (not fruit) there are a few basic reasons why you should prune, best remembered as the 4 Ds: Dead, Dying, Damaged and Diseased. Next, remove crossing or rubbing branches, any that have reverted to green and for shape.
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Desert Botanical Garden
Phoenix, Arizona, USA
Koishikawa Korakuen Gardens
Tokyo, Japan
Humble Administrator's Garden
Suzhou, China
Medellin Botanical Garden
Medellin, Columbia
Butchart Gardens
British Columbia, Canada
Royal Botanic Garden Sydney
Sydney, Australia