 
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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Rio de Janeiro Botanical Gardens
Rio de Janeiro, Brazil
Vallarta Botanical Garden
Vallarta, Mexico
Eram Garden
Shiraz, Iran
Lalbagh Botanical Garden
Bangalore, India
Royal Botanic Gardens Victoria
Melbourne, Australia
RHS Garden, Wisley
Woking, United Kingdom