Photo: Eric Hunt — CC BY-SA 4.0 · source
Survives zone 5 through 8
Harvest calendar
Best planted in early spring after your last frost, or in fall before the ground freezes, depending on your climate.
A once-towering Ozark and Ouachita Mountains tree — historically reaching 18 m or more — reduced by chestnut blight to a shrubby, repeatedly resprouting form across most of its range, and now the focus of an active restoration breeding program built on surviving blight-tolerant individuals.
- Hardiness
- Zone 5–8
- Habit
- Tree
- Edible part
- Nut
- Ripens
- Sept–Oct
- Mature size
- Tree 10–20 m — not containerable
- Light
- Partial to full sun
- Soil pH
- Castanea 4.5–6.5 — ⚠ LIME-INTOLERANT (calcifuge, unlike other nut trees). Quercus/Fagus 5.0–6.5
- Environment
- Temperate
- Native range
- The Ozark and Ouachita Mountains of Missouri, Arkansas, Oklahoma, Louisiana and Texas, with historical populations in Alabama now likely extirpated.
- Status
- Wild
- Years to fruit
- 3–5 yrs grafted
- Growth speed
- Historically a medium-to-large forest tree, but blight now keeps most individuals in a shrubby, repeatedly resprouting form rather than allowing sustained height growth.
- Spacing
- 700 cm (276 in) apart — about 49 m² (527 sq ft) per plant
- Leaf shape
- Narrowly obovate to oblanceolate, roughly 12-20 cm long (occasionally to 26 cm) by 3-10 cm wide, with a rounded to slightly cordate or cuneate base and a sharply serrate margin whose teeth end in awns over 2 mm long.
- Root system
- A strong taproot when young giving way to deep, wide-spreading laterals — chestnuts anchor well and stand drought once established, but they transplant badly for the same reason. Move them small, and never into wet ground: the tree is acutely susceptible to Phytophthora ink disease on soils that lie cold and saturated.
- Fruit description
- A two-valved, spiny cupule (spines over 10 mm) encloses a single oval-conic nut, 9-19 mm by 8-14 mm, round in cross-section rather than flattened — small but well-flavored, with a raw astringency that disappears on baking, when the texture turns sweet and floury.
- Propagation
- Grown from seed sown as soon as ripe, protected from rodents and kept moist (short viability; refrigerate damp if storing), germinating in late winter or early spring. Can be grafted onto Chinese chestnut rootstock, with grafted trees reported to bear within 1-2 years of grafting.
- Pollination
- ⚠ SELF-INCOMPATIBLE — needs TWO trees; a lone tree bears little or nothing
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.
Growing guide
Fertilizing. Highly tolerant of poor, dry, very acid sandy soils; prefers a well-drained slightly acid loam and, like other Castanea, dislikes calcareous ground though it can succeed on harder limestone.
How it spreads. Historically a single-trunked tree, but chestnut blight has reduced most stands to shrubby thickets that persist mainly by repeatedly resprouting from old root systems and stumps rather than by seed spread.
Growing tips. Highly susceptible to chestnut blight and devastated by it across its range — a tree that once reached 18 m or more is now typically a shrubby resprouter. The Ozark Chinquapin Foundation has been selecting and distributing seed from surviving blight-tolerant individuals since 2019 as part of an active restoration breeding effort; claims that these lines rival or exceed Chinese chestnut's blight tolerance come from that advocacy work rather than independent trials, so should be treated as promising but not fully verified.
Grow journal
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