This book introduces you to an interesting group of plants, from the mighty redwoods to the sharp needled spruces. It examines the various types of conifers, their reproductive methods, and how they get their energy. It also looks at the ecological importance of these woody plants and how they are used in industry. Did You Know? &&/UL&& The tallest living thing on Earth is a coast redwood, measuring a height of about 380 feet (115 meters). Most conifers keep their leaves throughout the year. The cones of some pine trees can reach 5 feet (1.5 m) long.