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Giant Sequoias

Sequoiadendron giganteum is the world's most massive tree.

About Giant Sequoias

Mariposa Grove in Yosemite National Park. Photo by Allie_Caufield, Flickr Creative Commons

Giant Sequoia Facts

FACT WHERE COMPARE
Tallest Tree: 316 feet Redwood Mountain Grove As tall as a 31-story building
Widest Tree: 34 feet Kings Canyon National Park The length of 2 Toyota Priuses
Biggest tree (by volume): 52,500 cubic feet Sequoia National Park About 31 school buses
Protected giant sequoia forest: 48,000 acres Along the western slope of the Sierra Nevada The size of Cleveland
Privately owned giant sequoia forest: 3,000 acres Along the western slope of the Sierra Nevada The size of Ukiah, California

To learn more, visit our Interactive Fact Finder page.

The Most Massive Trees

Being dwarfed by Earth's most massive tree, the giant sequoia, fills you with wonder. It's hard to believe that a living thing can be so enormous and old. Also known as Sierra redwoods, the largest of these trees that live in California's rugged Sierra Nevada mountain range, could hold a stadium full of people.

History

Redwoods once grew throughout the Northern Hemisphere. The oldest known redwood fossils date back more than 200 million years to the Jurassic period. Today, the last giant sequoias on Earth live on land about the size of Cleveland (48,000 acres), in about 75 groves scattered along the western slopes of the Sierra Nevada. The northernmost sequoias grow in Placer County in Tahoe National Forest, and the southernmost groves live in Giant Sequoia National Monument. The first widely publicized discovery of the giant sequoias was in 1852, at Calaveras Big Trees State Park. One of these trees, named the Discovery Tree, was unfortunately felled in 1853. It was determined to be 1,244 years old. Its stump was so large it was used as a dance floor.

Some sequoia groves were logged in the late 1800s and early 1900s, but not very successfully. The trees would often shatter when they hit the ground because of their brittleness and great weight. The leftover wood was used mainly for shingles and fence posts, or even for matchsticks, and therefore had little monetary value. Once Sequoia National Park was established, tourism brought a better incentive to protect the trees.

Biology

Some of the largest surviving giant sequoia groves can be seen in Sequoia and Kings Canyon National Parks, Giant Sequoia National Monument, Calaveras Big Trees State Park and Yosemite National Park. Sequoias are found at elevations of 1,400–2,150 meters (4,600–7,050 feet) and can live to be 3,000 years old!

Giant sequoias grow so large because they live a very long time and grow quickly. To thrive, giant sequoias require a great amount of water, which they primarily receive from the Sierra snowpack that accumulates over the winter months and soaks into the ground when it melts. Because they need well-drained soil, walking around the base of giant sequoias can cause them harm, as it compacts the soil around their shallow roots and prevents the trees from getting enough water.

Giant sequoias are generally well able to protect themselves against their natural threats, allowing them to survive for thousands of years. They are too massive to be blown over in the wind, and their bark is thick and rich in tannins, which protect them against fire and insect damage. Fire is an important element of the giant sequoia forest. Sequoia seedlings need nutrient-rich soil, lots of sunlight, and an area free of competition from other plants to thrive. Periodic wildfires help to produce all of these conditions and are therefore very beneficial to the reproduction of sequoia trees. Fire suppression policies in recent years have increased the growth of dense, brushy undergrowth and reduced the likelihood of giant sequoia regeneration. You can learn more about the impacts of fire on our redwood and sequoia forests through our blog.

Conservation

Since 1918, Save the Redwoods League has been working to protect, restore and conserve our remaining redwood forests. We have helped protect redwood forests and surrounding land totaling more than 200,000 acres (about the size of New York City). Our conservation work depends on close partnerships with scientists, land managers, industries and other land conservation organizations. We're the only organization with the type of comprehensive approach needed to ensure that forests that take one thousand years to grow will be here for another thousand years.

You can learn more about our conservation work by visiting our protect and restore pages.

John Muir, renowned naturalist and extensive explorer of the Sierra Nevada, was in awe of these giants. "There is something wonderfully attractive in this king tree, even when beheld from afar, that draws us to it with indescribable enthusiasm; its superior height and massive smoothly rounded outlines proclaiming its character in any company; and when one of the oldest attains full stature on some commanding ridge it seems the very god of the woods."

Research

To help protect giant sequoia forests, we must study them. There is still so much we do not know about these enormous giants and their surrounding forests. Through our Research Grants Program we have learned that:

  • Disturbances such as fire benefit giant sequoias, promoting growth of the ancient giants and creating conditions for regeneration of young trees. Sequoia regeneration needs open space, and researchers have discovered that gaps in the forest canopy up to 0.5 acres in size can help secure and promote that regeneration.
  • Sequoia trees are home to at least six species of bats who roost by day in basal hollows created by repeated fires, deep bark furrows, and cavities and crevices of tree crowns. By night, when not hunting insects, they choose basal hollows for shelter.
  • Two new species of fungus gnats were discovered to live with the sequoia trees. These small creatures play an important role in a complicated forest community and teach us there is much more to discover about these forests.

You can read more about League-funded research projects on our research grants page.

Redwoods and Climate Change Initiative

RCCI researcher Cameron Williams climbs a large Sequoiadendron at Giant Forest in Sequoia National Park. Photo by Anthony Ambrose

To meet the pressing need for research on how redwoods can survive sweeping environmental changes, the League and redwoods scientists launched the multiyear Redwoods and Climate Change Initiative. Our goal is to create a comprehensive climate adaptation strategy for the redwoods. These findings will help focus League efforts on where to protect and restore redwood forestland according to climate change forecasts.

Working on scales from leaves to landscapes, no other team of investigators in the world has the unique and complementary skills to conduct this integrated 10-year investigation of redwoods. The investigation includes a network of forest plots that can be monitored for more than 100 years. This program will yield data-based solutions to protect redwoods in a changing world. Read about our initial results on our Redwoods and Climate Change Initiative pages.

You Can Help

Today, it takes a community of caretakers — scientists, land managers, volunteers and donors — to protect redwood forests from unsustainable development, restore the forests we have lost, and inspire new generations to care for them. With your help, we know that these 2,000-year-old giants will inspire countless generations to come. Donate today.Secure Webpage

Giant Sequoias Gallery

Mushrooms in the Redwood Understory

Mushrooms appear with wet, wintery weather in the woods, including the redwood forest. Some species' bright colors are warnings to animals that fungi make toxic chemicals for protection.

Explore more redwood resources on our Redwoods Learning Center.

Humboldt Redwoods State Park

HIGHLIGHTS: A visit to the Eel River's magnificent redwoods inspired John C. Merriam, Madison Grant, and Henry Fairfield Osborn to establish Save the Redwoods League in 1918. Only three years later, the fledging organization won protection for the area.

Park Highlights & Visitor Information »