white oak

Photo: Marty Aligata at English Wikipedia — 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.

Acorns edible after leaching out bitter tannins; white oak acorns are naturally sweeter and lower in tannin than red oaks, needing less leaching.

Hardiness

Zone 3–9

Habit

Tree

Edible part

Nut

Ripens

Sept–Oct

Mature size

Large tree 25–30 m, often spreading as wide as it is tall — not containerable

Light

Full sun — acorn masting needs a 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 — Quebec and Ontario west to Minnesota, south to Texas and east to Florida, north to Maine; upland woods on well-drained soils.

Status

Wild

Years to fruit

3–5 yrs grafted

Growth speed

30–60 cm/year — medium, slower in youth while the taproot is built.

Spacing

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

Leaf shape

Alternate, 12–20 cm long, with 3–4 deeply cut rounded lobes on each side and a wedge-shaped base; bright green above, whitish beneath, turning wine-red in autumn and often holding dead leaves through winter.

Root system

A strong taproot dominates the first three years, driving 60–120 cm down while the top makes only modest growth — which is why oaks resent being moved once established and why nursery stock should be planted young. Mature trees add a wide lateral network.

Fruit description

Acorns 1.5–3 cm long, solitary or paired, the warty cup covering only a quarter to a third of the nut; sweet and comparatively low in tannin for an oak, needing far less leaching than red-oak acorns.

Propagation

⚠ White-oak-group acorns germinate in autumn, the moment they drop — they must be sown fresh and cannot be dried or stored like red oak acorns. Sow immediately in deep pots or straight into position, protected from mice; little or no cold stratification is needed.

Pollination

Wind-pollinated, monoecious; masting — several trees improve pollination

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.