chilgoza pine

Photo: Unknown — Public domain · source

Survives zone 7 through 9

Harvest calendar

Best planted in early spring after your last frost, or in fall before the ground freezes, depending on your climate.

Chilgoza pine produces the largest pine nut of any commercial species — thin-shelled kernels 17–23 mm long — prized across Afghanistan, Pakistan and northwest India, but wild populations are now IUCN-listed Near Threatened after decades of unsustainable cone harvesting that leaves too few seeds for natural regeneration.

Hardiness

Zone 7–9

Habit

Tree

Edible part

Nut

Ripens

Autumn (cones)

Mature size

Tree 10–20 m

Light

Full sun — cone/seed set needs sun

Soil pH

5.0–7.0

Environment

Arid montane

Native range

Dry temperate forests of the northwestern Himalaya — Afghanistan, Pakistan, northern India (notably Kinnaur district, Himachal Pradesh) and Tibet — at 1,800–3,350 m.

Status

Both wild and cultivated

Years to fruit

10+ yrs

Growth speed

Slow.

Spacing

600 cm (236 in) apart — about 36 m² (388 sq ft) per plant

Leaf shape

Needles in fascicles of three, stiff and spreading, 6–10 cm long, glossy green above with blue-green stomatal bands beneath.

Root system

A deep taproot from the first year, later joined by wide laterals near the surface — the combination that lets these pines hold rocky, droughty ground where little else will. The taproot is also why container-grown plants must go out young: a spiralled root never recovers.

Fruit description

Cones are large, 10–18 cm long and 9–11 cm wide when open, with wrinkled, reflexed scales. Seeds are unusually large for a pine nut — 17–23 mm long, 5–7 mm wide — with a thin shell that cracks easily and a rudimentary wing.

Propagation

By seed, though the hard, impermeable seed coat gives poor natural germination (20–40%); nursery protocols use about 60 days of cold stratification near 4°C, sometimes combined with mechanical scarification and gibberellic acid soaking, to lift germination to 50–70%.

Pollination

Monoecious, wind-pollinated — plant more than one

The edible parts listed above are a starting point, not a field guide. Identify a plant with certainty — ideally against a local authority — before eating any part of it, and read the full disclaimer. Spotted something wrong? Report it.