Mrs Green, who co-founded the National Trust of Australia in 1960 with her husband Richard (Dick), gave much of her life to Tasmania's heritage.

The mother of six, who lived at home until she was 97, is being remembered as a "remarkable" woman, wholly committed to the protection of some of the state's oldest architecture, including Franklin House and Clarendon House in Northern Tasmania.

She was a champion Tasmanian golfer, representing the state in the 1940s, who, in her twenties, became Launceston Golf Club's youngest woman 'captain member'.

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Mrs Green was awarded an Order of Australia Medal in 2014 for her service to the community, particularly through the heritage and conservation of historic properties, and in that same year, the Launceston City Council Citizen of the Year Award.

Her death has been acknowledged by Tasmanian government's heritage minister.

Daughter Caroline Johnston said her mother helped save Franklin House from demolition, and ran a committee of volunteers at Clarendon House for 50 years, ensuring the protection of the house and everything within it, as well as enabling public visits.

She said her mother was loyal to her values and to the people around her, including her husband and family.

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"Dad was a local councillor and mayor of Launceston in the late sixties, early seventies, and she was a committed mayoress, fully supportive of him and very proud of the way she supported her husband in those endeavours," Mrs Johnston said.

"She lost her husband in 1986 but continued to do all sorts of things with all sorts of organisations, and that has been super interesting for us to see her huge commitment," she said.

"She was an extraordinary lady."

Mrs Green's commitments included the Australiana Fund (Tasmania), the Tasmanian Symphony Orchestra, and the committee the Order of Australia Association Northern Region.

In 2016 the family, at Mrs Green's instigation, established The Dick & Joan Green Family Award to promote and celebrate Tasmanian history and cultural heritage.

This was followed by the establishment of a Green family literary award for books that focus on Tasmania's history, as well as an award for architectural design.

"They [Joan and Dick] were so involved in cultural heritage and history for so many years, saving all these buildings and generally making people aware of how important heritage was, built and other," Mrs Johnston said.

"We wanted to recognise that...through the written word on the history of Tasmania and through architectural experiences on heritage, and transforming or adding to buildings in a way that was culturally sensitive to the history, for contemporary needs."

Heritage Minister Nic Street acknowledged Mrs Green's dedication to Tasmanian history.

"It is with great sadness that I acknowledge the passing of Joan Green OAM," Mr Street said.

"Mrs Green dedicated a large part of her life to volunteer work for the benefit of Tasmania with an enthusiasm for which she was well known, including being instrumental in establishing Franklin House and Clarendon House as an active member and volunteer of the National Trust for over 50 years, two of Tasmania's most important and iconic historic properties," he said.

"On behalf of the Tasmanian government, I extend our deepest sympathies to Mrs Green's family and friends."

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