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
Pukekura Park
New Plymouth, New Zealand
Desert Botanical Garden
Phoenix, Arizona, USA
Kenrokuen Garden
Kanazawa, Ishikawa, Japan
Royal Botanic Gardens, Kew
Richmond, United Kingdom
Majorelle Garden
Marrakesh, Morocco