The effort was made with the help of water bombing, and a specialist force that was fired down from helicopters to work with an irrigation system on the ground, writes the Sydney Morning Herald.
"It was a military-like operation," the state's environment minister Matt Kean told the newspaper.
The operation in the National Park about 13 miles northwest of Sydney has been kept secret so as not to reveal exactly where the Wollemite figures - called dinosaur trees - are growing. The authorities do not want visitors there.
- Wollemi National Park is the only place in the world where these trees grow in the wild, and with less than 200 trees left, we felt we had to do everything we could to save them, says Kean.
100 and 200 million years agoAccording to Cris Brack at the Australian National University, fossil findings indicate that the trees existed throughout Australia between 100 and 200 million years ago.
The threat to the remaining dinosaur trees, discovered in 1994, was greatest at the end of the year as the huge so-called Gospers Mountains fire pulled through the national park.
"We held our breath and waited," Brack tells the Sydney Morning Herald.
A few days later, the smoke had eased, and the experts were able to find that most of the trees had passed.