Paper Birch
Betula papyrifera
Betulaceae · broadleaf deciduous tree · native
Last updated
Paper birch shares the bronze birch borer vulnerability of European white birch but has somewhat better resistance as a native North American species. It is still a poor long-term bet in the Puget Sound lowlands. Our warm summers stress the tree, attracting borers, and our climate pushes it toward the warm end of its tolerance. Expect a lifespan of 30-40 years at most in lowland Zone 8b. The white peeling bark is the draw, and it is genuinely beautiful in winter. If you insist on white-barked birch, water deeply every summer, mulch the root zone heavily, and plant in a spot that gets afternoon shade. Birch leafminer is cosmetic but persistent. For a longer-lived white-barked tree with better borer resistance, consider Betula jacquemontii or the native Betula papyrifera var. commutata, which is better adapted to our conditions.
— Chris Welch, ISA Certified Arborist
Paper birch (Betula papyrifera, Betulaceae) is a fast-growing deciduous tree native to northern North America, from Labrador to British Columbia and south in scattered populations to Pennsylvania, Nebraska, and Montana, with isolated high-elevation stands as far south as North Carolina and New Mexico. It typically reaches 40 to 50 feet tall (up to 70-plus feet) with a pyramidal young form maturing to irregular oval or rounded. The chalky-white bark peels in papery layers to reveal orange-brown inner bark; mature trees develop black markings. Leaves are 5 to 12 centimeters long, rounded, coarsely and usually doubly serrate, dull green in summer with yellow fall color.
Paper birch grows in full sun on moist, well-drained soils (pH 4.2 to 7.4), hardy in Zones 1a to 8b. It is a pioneer species that frequently colonizes burned areas and has high water needs; it handles heat and humidity poorly and is short-lived (often 30 years or fewer in Zone 6 and warmer). Maintenance needs are high due to shallow roots and sensitivity to stress. Documented diseases include rust, canker, and wood decay; pest associations include bronze birch borer, birch leafminer, aphids, and oystershell scale. The cultivar 'Renci' is in the focus list. Paper birch is a larval host for Luna moth and Eastern Tiger Swallowtail butterfly. The wood is valued for furniture, flooring, and pulpwood, and the bark was traditionally used for canoe construction.
Quick Facts
Phenological Calendar
As of April 3, 2026, Puget Sound stations range from 1070 to 1180.6 GDD₃₂. Paper Birch has passed 'leaf emergence' (1042 GDD₃₂).
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of Apr 3, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 1,181 | 'Leaf emergence' | — | — |
| Seattle / UW | 1,171 | 'Leaf emergence' | — | — |
| Kent / Auburn | 1,111 | 'Leaf emergence' | — | — |
| Olympia / Tumwater | 1,106 | 'Leaf emergence' | — | — |
| Bellingham / Whatcom | 1,101 | 'Leaf emergence' | — | — |
| Tacoma / Puyallup | 1,075 | 'Leaf emergence' | — | — |
| Sequim / Rain Shadow | 1,070 | 'Leaf emergence' | — | — |
| Stage | GDD32 | Typical Window |
|---|---|---|
| 'Bud break' BBCH '07' | 1042 | '' |
| 'Flower buds visible' BBCH '51' | 1042 | '' |
| ● 'Leaf emergence' BBCH '11' NOW | 1042 | '' |
GDD = Growing Degree Days (base 32°F, Jan 1 start). Why base 32? GDD₃₂ thresholds from USA National Phenology Network citizen science observations (WA+OR). Season tracker for Kent / Auburn as of Apr 3, 2026. Predicted dates use 16-day weather forecast through Apr 19, 2026, then climate normals.