American beech

Photo: Marqqq — CC BY-SA 3.0 · source

Survives zone 3 through 9

Harvest calendar

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

Triangular beechnuts edible, sweet, between pine nut and almond — best lightly roasted; the oil can be pressed. ⚠ Raw beechnuts contain fagin and oxalic acid; eating many raw can cause headache and nausea — eat only in moderation or roast.

Hardiness

Zone 3–9

Habit

Tree

Edible part

Nut

Ripens

Sept–Oct

Mature size

Large tree 20–35 m, spreading and shallow-rooted — not containerable

Light

Very shade-tolerant as a tree — but MAST (nuts) needs a dominant, sunlit crown

Soil pH

Castanea 4.5–6.5 — ⚠ LIME-INTOLERANT (calcifuge, unlike other nut trees). Quercus/Fagus 5.0–6.5

Environment

Woodland

Native range

Eastern North America — Nova Scotia and Ontario south to Florida and west to Texas and Wisconsin; rich moist hardwood forest, where it often forms root-sucker groves.

Status

Wild

Years to fruit

3–5 yrs grafted

Growth speed

30–50 cm/year — slow to medium, and very long-lived.

Spacing

1200 cm (472 in) apart — about 144 m² (1550 sq ft) per plant

Leaf shape

Alternate, oval to oblong, 6–14 cm long — larger than European beech, as grandifolia implies — with 9–14 pairs of straight parallel veins each ending in a distinct coarse tooth, rather than the European species' wavy untoothed edge.

Root system

⚠ Shallow, wide-spreading and strongly suckering — unlike European beech it throws root suckers freely, so a single tree becomes a grove and cut stems resprout. Very little grows in the dense shade above that root mat.

Fruit description

Triangular nuts about 1.5–2 cm long, usually two per bristly four-valved husk, sweeter and rather larger than European beech. ⚠ Raw beechnuts contain fagin and oxalic acid, plus saponins, and cause stomach upset and symptoms of poisoning if eaten in quantity raw. Roasting breaks these down — properly roasted nuts are fine, and the flavour improves — but keep raw nibbling to a very few nuts.

Propagation

Seed (beechnuts) must be sown fresh in autumn or given about three months cold stratification; viability drops fast if the nuts dry out, and mast years are irregular. Named forms are grafted.

Pollination

Wind-pollinated, monoecious; masting every ~3–4 years, with many empty "blank" nuts

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.