Inspections found resilient bush ecosystems were springing back to life, with rare and threatened plants recovering post-fires.

"I'm thrilled that the Saving Our Species (SoS) program has identified more than 15 of south eastern NSW's most threatened plants have re-sprouted or germinated from seeds, with evidence of burnt plants surviving the intense fires and hundreds of new plants emerging after recent rains," DPIE Department of Planning, Industry and Environment senior team leader for endangered and threatened species Damon Oliver said.

Read more: Meet the Illawarra animals on NSW's threatened species list

Meanwhile, the department said none of the species under watch had been lost - all had survived the fires.

"One jewel of this conservation effort is the Merimbula Star-hair, a threatened native plant found in only a couple of locations in the south-east ... but thankfully our teams have been onsite with NSW National Parks and Wildlife Service staff and found the star-hair alive and well, just metres from where the fire front wrought destruction.

"We know that many of our native plant species have evolved to survive fire but it has been a joy to see them re-shoot from burnt stems and regenerate in their hundreds from seed."

Threatened plant species and ecological communities that have shown post-fire recovery include the:

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