Aspen trees are deciduous trees known for their smooth, white bark and vibrant yellow leaves in the fall. They belong to the genus Populus and are commonly found in North America, Europe, and Asia. Aspens thrive in cooler climates and often grow in clusters, sharing a root system that allows them to regenerate easily after disturbances. These trees are also notable for their trembling leaves, which flutter in the wind due to their flattened petioles. Aspens provide important habitats for various wildlife, including birds and insects, and their wood is used in products like paper and furniture.