They were stripped of bark using handsaw and hatchet.
Exeter City councillor David Harvey has hit out at vandals after a number of trees were deliberately targeted in an area of natural importance to wildlife and ecology.
The authority is appealing for people with any information on the vandalism at Well Oak Park near the Royal Exeter & Devon Hospital
Four lime trees and a pine were deliberately stripped of bark.
Cllr David Harvey, Lead Councillor for Environment and City Management, said: “The fact that this has been done amid a backdrop of the country losing hundreds of thousands of trees through ash dieback makes this even more frustrating.
“This is nothing but criminal damage and I would appeal to anyone who has any knowledge of the attacks to contact the police.”
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