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Tasmania's giant ash trees may be world's tallest. Stephen Sillett's laboratory is dangling 90 metres above the ground. It is an intricate web of ropes and instruments strung up in the branches of a tree. And in the windy conditions that plague Tasmania's forests, it can be distinctly precarious.
One giant sequoia (Sequoiadendron giganteum), known as General Sherman, is the world's largest tree, while a redwood (Sequoia sempervirens) called Hyperion is the tallest. Giant sequoias. Giant sequoias can grow to be about 30 feet (9 meters) in diameter and more than 250 feet (76 meters) tall.