Officials wrapped the world's largest tree in protective foil to guard it ...

(CNN) — The world's largest tree has been wrapped in foil to protect it against flames from a fire raging in California's scenic Sequoia National Park.

General Sherman wrapped in foil to protect it from fire.

General Sherman wrapped in foil to protect it from fire.

Sequoia and Kings Canyon National Parks

The KNP Complex Fire, which is made up of the Paradise Fire and the Colony Fire, has charred 9,365 acres, so far. Lightning on September 9 caused the initial fire and prompted Sequoia National Park to close its doors to visitors.

Park crews are preparing the Giant Forest, which is home to over 2,000 sequoias, by removing fire fuel and wrapping the trees.

"Crews continue to apply protection wrapping (foil) to iconic sequoia trees and historic structures," according to Sequoia and Kings National Parks.

A fire-resistant wrap covers a historic welcome sign, as the KNP Complex Fire burns in Sequoia National Park, California, on Sept. 15, 2021. The blaze is burning near the Giant Forest, home to more than 2,000 giant sequoias.

A fire-resistant wrap covers a historic welcome sign, as the KNP Complex Fire burns in Sequoia National Park, California, on Sept. 15, 2021. The blaze is burning near the Giant Forest, home to more than 2,000 giant sequoias.

Noah Berger/AP

Even though crews are hard at work trying to protect these sequoias, they have already been hit hard by wildfires in recent years. "Two-thirds of all giant sequoia grove acreage across the Sierra Nevada has burned in wildfires between 2015 and 2020," the National Park Service says.
Firefighters assigned to the KNP Complex Fire prepare the historic Sequoia entrance sign for the possibility of fire in the area by wrapping it with aluminum-based burn-resistant material.

Firefighters assigned to the KNP Complex Fire prepare the historic Sequoia entrance sign for the possibility of fire in the area by wrapping it with aluminum-based burn-resistant material.

From Sequoai & Kings Canyon National Parks/Instagram

Sequoias that were killed during last year's Castle Fire could have ranged from hundreds to 3,000 years old, the service added.

Officials sounded optimistic though, reporting minimal fire growth Thursday despite some activity picked up late in the afternoon as the temperature increased and humidity levels dropped.

Giant sequoias aren't known to be the world's oldest trees, but "they are known to reach ages of up to 3,400 years," according to the National Park Service.

And even though giant sequoias adapt to periodic fire, the bark usually protects the trees against significant damage and can insulate them against a fire's heat, NPS said. Over time, however, it may be difficult for the trees to heal after centuries of fire scars.

CNN's Stella Chan, Cheri Mossburg and Christina Maxouris contributed to this report.

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