Quaking Aspen (Populus tremuloides) are delightful trees that create habitat for many different kinds of birds, mammals, and insects. Additionally, Aspens are fast growing and make excellent landscaping plants.
These are second year seedlings, 4 to 6 feet tall, bare root. These get trimmed back to fit inside a 4 foot box when shipping.
Photo credit: Zion National Park, Public domain, via Wikimedia Commons