The cones of giant sequoia are similar, but larger than those of redwood. While those trees grown in the open, or in nurseries, may begin bearing cones as young as age 10, most giant sequoias in the forest do not begin to produce large cone crops until they are nearly 200 years old. The woody cones of giant sequoia are two to four inches long, and are approximately egg-shaped. Cones reach their full size in their first year, but require a second year to mature. Cones tend to persist on the tree, often remaining closed for as many as twenty years, before releasing their tiny seeds.