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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Kenrokuen Garden
Kanazawa, Ishikawa, Japan
Lalbagh Botanical Garden
Bangalore, India
Shinjuku Gyoen National Garden
Tokyo, Japan
Powerscourt Gardens
Enniskerry, Co. Wicklow, Ireland
Saint Petersburg Botanical Garden
Saint Petersburg, Russia
Eram Garden
Shiraz, Iran