Pine is an evergreen conifer found throughout the temperate and cold regions of the world, and is one of the most widespread conifer species. Pine can typically grow to 20 meters or even taller. The needles of pine are usually dark green or blue-green in color, and sometimes have white or yellow stripes. Pine pollen is a major allergen in the spring. The cones produced by pine in the fall are one of their most distinctive features and are usually cone-shaped or spherical. Pine wood is hard and has an attractive grain, and is used for construction, furniture, and paper pulp. In addition, pine is widely used in horticulture and landscaping, and has a strong adaptability to various environments.