A few rare giant sequoias have grown taller than 300 feet, but it is the sequoia’s giant girth that sets it apart. A giant sequoia tree is a commitment. They are usually more than 20 feet in diameter and up to 35 feet across. Giant Sequoia (Sequoiadendron giganteum) – This species isn’t quite as tall, but has a much thicker base and overall look and can live up to 3,200 years old! The tallest on record stands at 311 feet, and the oldest has been living for 3,500 years. Each cone has 30–50 spirally arranged scales, with several seeds on each … It is the only living member of its genera. Giant sequoia trees are the giants of the plant kingdom, growing to large dimensions, both in height and volume. Invest in the millennium. The poet Wendell Berry said: “Ask the questions that have no answers. General Sherman, a specimen located in Giant Forest in Sequoia National park is close to 275 feet tall. They are also very long-lived. Giant Sequoia Trees: A Field Guide. Plant sequoias.” The giant sequoia regenerates by seed.The seed cones are 4–7 cm (1 1 ⁄ 2 –3 in) long and mature in 18–20 months, though they typically remain green and closed for as long as 20 years. The Sierra redwood, on the other hand, usually only reaches 60 feet or so in the garden, though true to its name the “giant sequoia” can reach heights of 300 feet in the wild.