Hamilton authorities are ditching the lawnmower in parts of the city for the betterment of the planet.

The City Council has launched a no-mow trial for 13 green spaces- aiming to increase biodiversity and reduce the carbon emissions created by mowing.

Hamilton Council Park Services Manager Duncan MacDougall says they won't be letting everything overgrow.

"Not the whole park will be mown like this- the boundaries around trees and those sorts of things will still be maintained as they are now, there'll just be sections set aside."

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