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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Singapore Botanic Gardens
Singapore
Rio de Janeiro Botanical Gardens
Rio de Janeiro, Brazil
Desert Botanical Garden
Phoenix, Arizona, USA
Keukenhof
Lisse, Netherlands
Humble Administrator's Garden
Suzhou, China
Majorelle Garden
Marrakesh, Morocco