Giant Sequoias [wiki] (Sequoiadendron giganteum), which only grow in Sierra Nevada, California, are the world's biggest trees (in terms of volume). The biggest is General Sherman [wiki] in the Sequoia National Park - one behemoth of a tree at 275 feet (83.8 m), over 52,500 cubic feet of volume (1,486 m³), and over 6000 tons in weight.
General Sherman is approximately 2,200 years old - and each year, the tree adds enough wood to make a regular 60-foot tall tree. It's no wonder that naturalist John Muir said "The Big Tree is Nature's forest masterpiece, and so far as I know, the greatest of living things."
For over a century there was a fierce competition for the title of the largest tree: besides General Sherman, there is General Grant [wiki] at King's Canyon National Park, which actually has a
larger circumference (107.5 feet / 32.77 m vs. Sherman's 102.6 feet / 31.27 m).
In 1921, a team of surveyors carefully measured the two
giants - with their data, and according to the complex American Forestry Association system of judging a tree, General Grant should have been award the title of largest tree - however, to simplify the matter, it was later determined that in this case, volume, not point system, should be the determining factor.
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