A few rare giant sequoias have grown taller than 300 feet, but it is the sequoia’s giant girth that sets it apart. The poet Wendell Berry said: “Ask the questions that have no answers. 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! Invest in the millennium. They are usually more than 20 feet in diameter and up to 35 feet across. 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. A giant sequoia tree is a commitment. General Sherman, a specimen located in Giant Forest in Sequoia National park is close to 275 feet tall. The tallest on record stands at 311 feet, and the oldest has been living for 3,500 years. Plant sequoias.” Giant Sequoia Trees: A Field Guide. They are also very long-lived. Each cone has 30–50 spirally arranged scales, with several seeds on each … 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. 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.