The pine cones of the tree resemble the cones of the Siberian pine (P. sibirica). The cones are larger and thicker and not as much elongated as Japanese stone pine (P. pumila) cones. On average the cones are 4 cm long and 3 cm wide. Each cone contains 40 nut-like seeds. Seeds are on average 8 mm long. Only about 15% (at most) of the seeds in the cones are fertile. Ripe cones are purple, just like those of P. sibirica. Seed development and production are very poor in the putative hybrids, indicating that introgression occurs very slowly or does not occur beyond the first filial generation.
