Mariposa Grove of Giant Sequoias Professional Review and Guide
"Yosemite National Park has three giant sequoia groves. Of these three, the Mariposa Grove of Giant Sequoias is the largest and most visited. It is divided into two groves—Upper Grove and Lower Grove. Some of these giant sequoias are believed to be nearly 3,000 years old. Their average height is 250 feet, with a base diameter of 15 to 20 feet and bark two feet thick. Their shallow roots are only 3 to 6 feet deep but extend outwards up to 150 feet to support the massive trees. They are among the oldest and largest living things on earth and are resistant to disease, insects and fire. Mariposa Grove has an impressive display of more than 300 mature giant sequoias within its 250-acre area. One of the largest and oldest trees in this grove is the Grizzly Giant, estimated to be 2,700 years old with a height of 200 feet and a 30-foot diameter. Although the grove is dominated by giant sequoias, there is a forest mix of ponderosa pine, sugar pine, white fir, black oak and incense cedar."