Castanopsis hystrix aka Patle Katus

Castanopsis hystrix is challenging to grow outside its native subtropical range. It demands a warm continental climate, lime-free soil, and a sheltered semi-shaded position. Maritime or cool-temperate climates are unsuitable. Seeds require cold stratification and seedlings need frost protection in their early years.

A large evergreen tree reaching up to 30 meters in height, with a moderate growth rate. Seeds mature in October to November, approximately five months after flowering.

Prefers consistently moist soil. It naturally grows in moist subtropical forests and benefits from regular water availability, particularly during establishment.

Requires a good deep medium to heavy (clay-loam) soil that is lime-free, with a mildly acidic to neutral pH. A sheltered position in semi-shade is recommended. Does not tolerate alkaline or chalky soils.

Performs best in a warm continental climate. While it can tolerate cold, it does not thrive in cool maritime climates. Seedlings are particularly frost-sensitive and need protection during their first winters.

The catkins produce an unpleasant hawthorn-like scent during the flowering period (May to June), evolved specifically to attract midges as pollinators. The scent is not pleasant but is functionally important for pollination.

Flowers appear from May to June. The tree is monoecious, producing both male and female flowers on the same plant in very small catkins. The catkins emit an unpleasant hawthorn-like odour to attract midges. Seeds mature October to November; they are small (up to 14mm diameter) nut-like seeds with a good flavour.

Best suited to warm subtropical or warm-temperate continental climates. Native from the Himalayas through Southeast Asia and southern China. Needs a sheltered semi-shaded position and lime-free, moist, deep loamy soil. Not well suited to maritime or cool-temperate regions.

Propagate from seed. Seeds have short viability and must be kept moist; sow fresh in cold frames with cold stratification. If storing seeds, soak in warm water for 24–48 hours before sowing. Germination typically occurs within 1–3 months at 15°C. Protect seedlings from frost during their first winters.

Castanopsis hystrix is pollinated by wind and midges. The catkins emit an unpleasant hawthorn-like scent specifically to attract midges as pollinators. The tree is monoecious, bearing both sexes on the same individual.

The seeds are edible raw or cooked, small (up to 14mm in diameter) but described as having a good flavour. Flowers are also technically edible. The species receives an edibility rating of 2 out of 5.

No medicinal uses are documented for this species in the consulted references.

The wood is hard and has been used for construction, fencing, and fuel.