It was adopted by Rotary and a band of volunteers, who continued Mr Sansom's work of transforming it into English-style woodland. Two of its key volunteers, John Horrell and John Graham, were named New Zealand's Gardeners of the Year in 2013 for their efforts.
Mr Sansom left the rest of his land, about 5.4ha, to his late sister Lavender Sansom in the UK. Her land, with a resource consent allowing it to be broken up into 14 sections, is now about to go on the market.
Mr Upperton said the group's aim was to secure "Lavender's land" for future generations. If successful Roland's Wood would more than double in size and parking could be greatly improved.
Other possibilities for Lavender's land included adding a pergola and children's playground, and planting the steepest part in dog-free native bush.
Mrs Sansom's land had been left to her sons overseas.
"They obviously want a fair price, but they like the idea of adding to Roland's Wood and leaving a bit of a legacy," Mr Upperton said.
While the vendors had yet to set an exact price, the trust was aiming to raise $600,000 - enough to buy the land, continue planting and develop better access and parking.
The trust had set up a Givealittle account and was also approaching the Far North District Council, wealthy Northlanders and foundations. The beauty of Givealittle is that people's donations are secure and would be returned if the target is not reached.
"We have a window of only a few months so it's time critical," Mr Upperton said.
Go to https://givealittle.co.nz/org/friendsofrolandswood to donate.