Pinus flexilis 'Cesarini Blue' / Cesarini Blue limber pine

Pinus flexilis 'Cesarini Blue' is a slow-growing, narrow, upright selection of limber pine with compact branching and long, powder-blue needles. After 10 years of growth, a mature specimen will measure 7.5 feet (2.5 m) tall and 40 inches (1 m) wide, an annual growth rate of 6 to 8 inches (15 - 20 cm).

This cultivar originated as a seedling selected and named for noted plantsman, Joe Cesarini of Ridgely, Maryland. Similar cultivar names exist for P. peuce and strobus in violation of nomenclature rules that allow a specific cultivar name to be used only once within a single genus.
Pinus flexilis 'Cesarini Blue' in a private garden in Wisconsin. Although described as a zone 5 tree it is doing very well in his zone 3 with no winter damage.
Photo by Bill Hoffman
Pinus flexilis 'Cesarini Blue' — a gift from the ACS when I attended my first meeting in 2012. Pictured in Maine, 2013.
Photo by Wynne Keller