Provide young giant sequoia (Sequoiadendron giganteum) with sufficient light, water and fertilizer, and you will find caring for the most massive tree species in existence is surprisingly trouble-free. Hardy in U.S. Department of Agriculture plant hardiness zones 6 through 9, giant sequoia doesn't suffer significantly from pests or disease. Given proper growing conditions and care, in one growing season your giant sequoia can add 36 inches to its height and 2 inches to the width of its trunk. Eventually it can grow to 260 feet tall -- long-living Sequoias can live more than 3,000 years and grow to 325 feet. The giant sequoia thrives in areas where annual rainfall is between 4 1/2 and 6 inches per year and where the soil is moist but drains well.