Pinus pumila 'Yes-Alpina' / Yes-Alpina Japanese stone pine
Pinus pumila 'Yes-Alpina' is a dwarf, spreading selection of Siberian stone pine with uniform, upward-facing branchlets and fluffy, blue-green needles. After 10 years of growth, a mature specimen will measure 2.5 feet (75 cm) tall and 4.5 feet (1.5 m) wide, an annual growth rate of 4 to 6 inches (10 - 15 cm).
This cultivar originated under unknown circumstances. It's first mention in botanical literature appears to be in the Iseli Nursery Catalog from 1982. As a cultivar name, 'Yes-Alpina' is nonsensical. It appears to be wordplay on the term jezoalpina, which refers to plants native to the mountain slopes of Japan's Hokkaido Island. Regardless, this plant is fairly well-known and widely established under the name, 'Yes-Alpina' regardless of the originator's intent.
Pinus pumila 'Yes-Alpina' at Half Moon Nursery, Holicong, Pennsylvania.
Photo by Larry Nau
Pinus pumila 'Yes-Alpina' at Half Moon Nursery, Holicong, Pennsylvania; a closeup of foliage detail.
Pinus pumila 'Yes-Alpina' — accessioned in 2004 by the Morris Arboretum, Philadelphia, Pennsylvania; photo from 2020.
Photo by Katherine Wagner-Reiss