Chilgoza pine

The trees are 15–25 metres (49–82 ft) tall with usually deep, wide and open crowns with long, erect branches. However, crowns are narrower and shallower in dense forests. The bark is very flaky, peeling to reveal light greyish-green patches. The branchlets are smooth and olive-green. The leaves are needle-like, in groups of three, 6–10 centimetres (2+1⁄2–4 in) long, and spread stiffly. They are glossy green on the outer surface, with blue-green stomatal lines on the inner face; their sheaths fall in the first year. The cones are 10–18 cm (4–7 in) long and 9–11 cm (3+1⁄2–4+1⁄2 in) wide when open, with wrinkled, reflexed apophyses and an umbo curved inward at the base. The seeds (pine nuts) are 17–23 millimetres (5⁄8–7⁄8 in) long and 5–7 mm (3⁄16–1⁄4 in) broad, with a thin shell and a rudimentary wing.

Similar species. P. gerardiana is similar to the closely related lacebark pine (Pinus bungeana), another pine with flaking bark. However, P. gerardiana has denser, longer, and more slender needles, as well as larger cones than P. bungeana.

P. gerardiana is native to Afghanistan, Pakistan, India, and Tibet. It grows at elevations of 1,800–3,350 m (5,910–10,990 ft). It inhabits valley floors in the Himalayas, tending to grow among open vegetation on dry, sunny slopes.

It often occurs in association with Cedrus deodara, and Pinus wallichiana. Since their seeds do not have a wing capable of enabling effective dispersal by wind, the seeds of P. gerardiana are dispersed by birds. The Eurasian nutcracker (Nucifraga caryocatactes subsp. multipunctata) is one such species that does so. P. gerardiana is also a secondary host for Himalayan dwarf mistletoe.

Older trees that do not produce enough cones to harvest pine nuts from are felled for firewood. The wood is also used for local light construction and carpentry.

Food. Chilghoza seeds, or pine nuts, are harvested for consumption in autumn and early winter by knocking the cones off of the trees. The trees and seed harvesting rights are owned by local mountain clans and villages in some areas, from which they may be exported to markets in the northern Indian plains. In traditional harvesting practices, enough seeds are left behind for the forest to regenerate, but in areas controlled by private contractors, all cones are harvested. Chilgoza pine nuts are rich in carbohydrates and proteins. The seeds are locally referred to and marketed as "chilgoza", "neja" (singular) or "neje" (plural). Chilghoza is one of the most important cash crops of Afghanistan, as well as of Kinnaur and Pangi Valley of Chamba district of Himachal Pradesh, India. They are sold at approximately $20–$53 per kilograms in India.