Photo: Percita at Flickr — CC BY-SA 2.0 · source
Survives zone 2 through 7
Harvest calendar
Ripens: Early spring at the thaw — a short 2–3 week sap flow
Best planted in early spring after your last frost, or in fall before the ground freezes, depending on your climate.
Spring sap tapped for syrup or drunk fresh — around 2.5% sugar; the standard European tapping birch.
Spread warning. Documented as invasive/naturalized outside cultivation in parts of North America, including listings on invasive-plant registries in Kentucky, Maryland, Washington State, and Wisconsin.
- Hardiness
- Zone 2–7
- Habit
- Tree
- Edible part
- Sap
- Ripens
- Early spring at the thaw — a short 2–3 week sap flow
- Mature size
- Large tree 15–25 m — not containerable
- Light
- Full sun
- Soil pH
- 6.0–7.5 (lime-tolerant)
- Environment
- Temperate to boreal
- Native range
- Europe and western Asia, from the British Isles and Scandinavia east through Siberia, and south into the Caucasus, northern Turkey, and northern Iran.
- Status
- Sap
- Years to fruit
- About 15 years to first seed production.
- Growth speed
- Fast — up to about 1m of height growth per year while young — but short-lived (often 60–90 years) compared with the North American sap birches.
- Spacing
- 900 cm (354 in) apart — about 81 m² (872 sq ft) per plant
- Leaf shape
- Small, triangular to rhombic (diamond-shaped) leaves 3–7cm long with a long-pointed tip and doubly serrate margin, borne on glabrous, warty (resin-studded) shoots; turns yellow in autumn.
- Root system
- Shallow, wide-spreading lateral root system typical of the genus; adaptable to poor soils but sensitive to compaction and prolonged drought.
- Fruit description
- Small, drooping cylindrical female catkins that break up at maturity into minute winged nutlets dispersed by wind; slender male catkins form in autumn and shed pollen the following spring.
- Propagation
- By seed — cuttings are difficult in this genus. Sow fresh seed in a cold frame in autumn, just covering it, or surface-sow in spring; germination improves under glass for extra warmth. Grow seedlings on for about 2 years before planting out permanently.
- Pollination
- Wind-pollinated, monoecious catkins — irrelevant to a sap crop
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. Tolerant of poor, sandy soils; prefers well-drained loam with pH below 6.5 but adapts to neutral or mildly alkaline ground. PFAF describes it as a dynamic accumulator whose root activity helps improve surrounding soil — no heavy feeding is needed.
How it spreads. A vigorous pioneer and prolific self-seeder — light, winged seed is carried widely by wind onto bare or disturbed ground, and it is often one of the first trees to colonise cleared land or burn sites. Documented as invasive/naturalized in parts of North America.
Growing tips. Fast-growing (up to about 1m/year while young) but short-lived, and eventually shaded out by longer-lived woodland trees. Needs full sun — cannot tolerate shade. Considerably more susceptible to bronze birch borer than the North American birches: in a 20-year Ohio common-garden trial, European birches (including this species) fared far worse against the borer than native paper, gray, and river birch. Shallow, wide-spreading roots make it drought- and compaction-sensitive, though the tree itself is fairly wind-firm. Tap in early spring before leaf-out; sap flows at roughly 4–7 L/day per tap without harming the tree if holes are sealed afterward; sugar content is around 2.5%, with roughly 100 L of sap needed per litre of syrup.
Companion planting. PFAF describes it as a good nurse tree for young seedlings of other species and a beneficial companion whose root action improves soil; it supports a very large associated insect fauna (around 229 species) but shares bronze-birch-borer susceptibility with other stressed birches planted nearby.
Grow journal
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