Northern Lights

• Northern lights, with their high tolerance for temperatures as low as -45 degrees, are hybrid azaleas well-suited for zone 2. The shrubs bloom with pink flowers and grow to mature heights of about 6 feet.
  
  

Boxelder

• Boxelder (Acer negundo) is an irregularly shaped tree with a mature height of about 50 feet. A native of the cooler regions of the United States, boxelder is well-suited to USDA Zone 2. The tree is among the most cold-hardy of shade trees, as cited by the Floridata site.
  
  

False Sunflower

• False sunflower (Heliopsis helianthoides) is a North American native plant highly tolerant of very low temperatures and adapted to USDA Zone 2. The perennial grows 5 feet tall and blooms with daisy-like, bright yellow flowers. The rough, dark green foliage is 3 to 6 inches long. False sunflower grows optimally in areas of full or partial sun.