Previously thought to have been extinct for 2 million years and only known from fossil records, Wollemi Pine was discovered in 1994 at a remote canyon in the state's Blue Mountains region, reports Xinhua news agency.
"It's one of the world's oldest and rarest plants from the time of the dinosaurs and there are less than 100 trees left in the wild," NSW Environment Minister Gabrielle Upton said.
The new population of ancient trees translocated by the NSW Office of Environment and Heritage, acts as an "insurance policy" for the original group.
"Creating a self-sustaining insurance population will ultimately boost numbers to secure species in the wild," Upton said.
"Some 83 per cent of the insurance Wollemi pines are surviving and have increased in size by up to 37 per cent making them mature enough to produce potentially viable seeds much earlier than expected," she said.
Botanists believe the ancient tree came into existence some 200 million years ago.
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