Photo: The original uploader was Peatcher at German Wikipedia. — CC BY-SA 3.0 · source
Survives zone 4 through 8
Sweet chestnut excellent roasted; ⚠ acorns must be leached of tannins.
- Hardiness
- Zone 4 to 8
- Habit
- Tree
- Edible part
- Nut
- Ripens
- Sept–Oct
- Mature size
- Large tree — NOT containerable
- 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
- Status
- Blight-hit
- Years to fruit
- 3–5 yrs grafted
- Pollination
- ⚠ SELF-INCOMPATIBLE — needs TWO trees; a lone tree bears little or nothing
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.