Photo: The original uploader was Peatcher at German Wikipedia. — CC BY-SA 3.0 · source
Survives zone 4 through 8
Harvest calendar
Best planted in early spring after your last frost, or in fall before the ground freezes, depending on your climate.
Once a dominant eastern-US canopy tree reaching 30 m with the sweetest-tasting nuts of any chestnut species, American chestnut was reduced to near-extinction in the wild within a few decades of the early-1900s blight epidemic, and most survivors today are root-collar sprouts that die back long before they can bear fruit.
- Hardiness
- Zone 4–8
- Habit
- Tree
- Edible part
- Nut
- Ripens
- Sept–Oct
- Mature size
- Was a 30 m forest giant; blight now holds it to a 5–10 m stump-sprout that dies back before maturity
- Light
- 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
- Eastern North America, from Maine and southern Ontario south through the Appalachian Mountains to Mississippi and Georgia — historically a dominant ridge and slope tree on acidic, well-drained soils.
- Status
- Blight-hit
- Years to fruit
- 3–5 yrs grafted
- Growth speed
- Historically fast-growing, capable of outpacing oaks in height growth; today blight-killed root systems still send up vigorous sprouts that can reach 4-6 m before dying back, rarely living long enough to fruit.
- Spacing
- 850 cm (335 in) apart — about 72 m² (778 sq ft) per plant
- Leaf shape
- Oblong-lanceolate, 14-20 cm long by 7-10 cm wide, with larger, more widely spaced saw-teeth along the margin than related species — the source of the species name dentata, meaning toothed.
- Root system
- A deep taproot, described as running straight down like a carrot's.
- Fruit description
- Spiny green burrs typically hold three nuts, each lined in tan velvet — regarded as the sweetest-tasting nuts of any chestnut species, though wild nuts are now scarce because blight kills trees before they reach bearing age.
- Propagation
- Propagated from seed sown immediately after ripening — viability is short-lived and seed must not dry out, though it can be refrigerated moist for a few months — germinating in late winter or early spring, with seedlings kept in nursery beds for 1-2 years before planting out. Blight-tolerant breeding lines from the American Chestnut Foundation's backcross program are propagated by 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. Not typically fertilized in forest or restoration settings beyond ensuring fertile, well-aerated soil; young cultivated trees can be given a balanced fertilizer in early spring, but over-fertilizing should be avoided.
How it spreads. Resprouts vigorously from the root collar and stump after top die-back — a survival trait against blight that lets it persist as an understory sprout-clump — but otherwise does not sucker or self-seed aggressively, since its deep taproot and the scarcity of cross-pollinated, viable nuts limit natural spread.
Growing tips. Deep taproot makes it resent transplanting once established, so set out young stock; requires sharply well-drained, moderately acidic soil, since standing water encourages Phytophthora root rot (ink disease); the dominant threat is chestnut blight, which has killed nearly all mature wild trees, so blight-resistant or backcrossed stock is strongly preferred and crowding with other chestnuts should be avoided.
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