Ndị omebe iwu steeti họpụtara California redwood ka ọ bụrụ osisi steeti California na 1937. Ozugbo a na-ahụkarị na Northern Hemisphere, a na-ahụ osisi redwood naanị na Pacific Coast. A na-echekwa ọtụtụ osisi na ebe kwụ ọtọ nke osisi ndị dị elu na ogige ntụrụndụ steeti na nke mba na ọhịa. Enwere n'ezie mkpụrụ ndụ abụọ nke California redwood: n'ụsọ oké osimiri redwood (sequoia sempervirens) na nnukwu sequoia (Sequoiadendron giganteum).
Osisi redwood dị n'ụsọ oké osimiri bụ osisi kachasị ogologo n'ụwa; otu ruru ihe karịrị 379 ụkwụ n'ogologo na-eto na Redwood National na Park Park.
Otu nnukwu sequoia, General Sherman Tree na Sequoia & Kings Canyon National Park, karịrị 274 ụkwụ n'ịdị elu na ihe karịrị 102 ụkwụ gburugburu na ala ya; a na-ewere ya dị ka osisi kacha ukwuu n'ụwa n'ozuzu ya.