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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Keukenhof
Lisse, Netherlands
Royal Botanic Garden Sydney
Sydney, Australia
Rikugien Gardens
Tokyo, Japan
Gardens of the Generalife, Alhambra
Granada, Spain
Majorelle Garden
Marrakesh, Morocco
Royal Botanic Gardens, Kew
Richmond, United Kingdom