American Plum (Prunus Americana) is late-ripening, thicket-forming, and easy to grow. Unbothered by pests, and loved by wildlife.
1 to 2 feet tall, bare-root.
Photo Credit: Dick Culbert from Gibsons, B.C., Canada, CC BY 2.0 <https://creativecommons.org/licenses/by/2.0>, via Wikimedia Commons