The Sequoias are only found in places where ample underground moisture is available in summer. Attempts to grow these trees in Northern States and other cold or wet climates have generally failed.

Giant Sequoias (Sequoiadendron giganteum) are native only to a very narrow, 260-mile strip on the western slope of California's Sierra Nevada mountains. Their survival in 2026 is tied to a "perfect storm" of environmental factors found nowhere else on Earth. They require a specific elevation (roughly 4,000 to 8,000 feet) where the climate is humid but the summers are dry. They rely heavily on the Sierra snowpack, which provides a slow, steady release of moisture into the soil throughout the dry summer months. Furthermore, they are "fire-dependent"; their cones only release seeds when triggered by the heat of a low-intensity forest fire, which also clears the forest floor of competing vegetation. While they have been successfully planted in places like the UK and New Zealand, they do not naturally reproduce or reach their massive, ancient potential outside of their unique Californian groves.