Yellow Birch

Pollinator Value

🔑 Keystone: Betula is a keystone genus in the Outaouais region, supporting 403 species of butterflies and moths as larval hosts. Yellow birch contributes to this extraordinary biodiversity value alongside three other native birch species (B. papyrifera, B. populifolia, B. lenta). The genus ranks among the top native woody plant genera for lepidopteran support in eastern North America.
S13 403 lepidoptera spp.; S10 extensive faunal associations
🐛 Larval Host: Habrosyne scripta, Furcula scolopendrina, Polygonia faunus, Limenitis archippus, Ceratomia amyntor, Amorpha juglandis, Nymphalis antiopa, Paonias myops, Lochmaeus manteo, Orgyia definita, Acronicta interrupta, Sphinx kalmiae, Pyrrharctia isabella, Synchlora aerata, Limenitis arthemis
S13+S15 15 verified Eastern NA
❄️ Winter Food Source: Ruffed Grouse feed on yellow birch buds and catkins, which persist through winter on the tree. Seeds, catkins, and buds are also consumed by Common Redpoll, Black-capped Chickadee, Purple Finch, White-winged Crossbill, and Dark-eyed Junco. Red Squirrels feed on the seeds through winter months.
S57 Ruffed Grouse 8.3% diet; S10 birds and mammals feeding on seeds, catkins, buds

Proximity Score: 0
Native Status: ✅ Outaouais ✅ Ottawa ✅ QC ✅ ON
Closest Direction: Local
CEC Eco-Regions: 5 – Northern Forests, 5.2 – Mixed Wood Shield, 5.2.3 – Algonquin/Southern Laurentians
Rarity Notes: Globally secure (G5) with national rank N5 in both Canada and the United States. Secure in Ontario (S5) and Apparently Secure in Quebec (S4). Not listed under SARA or COSEWIC. The species reaches about 50% of its North American growing stock volume in Quebec, where it is one of the most important hardwood timber species.
S22 G5, N5; S26 not SARA listed; S41 50% growing stock in Quebec
Rarity Ranks: QC S4 – Apparently Secure, ON S5 – Secure
Migration: Stable
Ecological Context: Yellow birch is a characteristic component of the northern hardwood and hemlock-hardwood forests of the Algonquin/Southern Laurentians ecoregion. It typically occupies moist, well-drained slopes and ravines in association with sugar maple, American beech, and eastern hemlock. In the Outaouais, it is found in rich mesic forests and along stream corridors, often growing from mossy logs and boulders.
S41 characteristic tree of northern hardwoods; S6 stream banks, swampy woods, rich forested slopes; S12 one of the largest trees of the Laurentian forest

Roles: Fortress/Barrier, Nutrient Accumulator, Wildlife Habitat
S73/S29/S72 Evidence: Fortress/Barrier: S61 keyword match: thorns? (supporting signal only)] | Nutrient Accumulator: S72 Hemenway (tables: 6-2, 7-2, pp. 96, 116)] | Wildlife Habitat: S72 Hemenway (tables: 6-2, 7-2, pp. 96, 116)]
Notes: Yellow birch functions as a dynamic accumulator, mining phosphorus, potassium, and calcium from deep soil horizons and depositing them in leaf litter. Its shallow, spreading root system complements deeper-rooted associates like sugar maple. The exfoliating bark and persistent catkins provide year-round wildlife habitat. In guild design, it serves as a canopy-layer nutrient pump paired with shade-tolerant understory species.
S29 dynamic accumulator; S72 P, K, Ca accumulation (Table 6-2); S41 shallow root system

Category: Cathartic, Emetic, Diuretic, Blood Medicine, Dermatological Aid, Gastrointestinal Aid, Liver Aid, Gynecological Aid
S28 Moerman categories; S29 antiseborrheic, cathartic, emetic
Notes: Delaware used bark decoction as a cathartic and emetic and to remove bile from intestines. Iroquois employed a complex compound as a blood purifier and a decoction as a wash for skin conditions. Ojibwa used inner bark decoction as a diuretic and for internal blood diseases. Bark yields Oil of Wintergreen (methyl salicylate), used mainly as a flavouring in medicines. Potawatomi used twig infusion as a seasoner for other medicines.
S28 Moerman 11 drug uses across 5 nations; S29 Oil of Wintergreen

✅ Edible

Foraging Notes: Sap can be tapped in early spring and consumed raw as a sweet drink, concentrated into syrup, or fermented into birch beer. Sugar content is much lower than maple sap. Inner bark was historically used as a famine food, dried and ground into flour for bread. Twigs and leaves yield a wintergreen-flavoured tea. The Algonquin of Quebec mixed birch sap with maple sap when the latter was insufficient.
S29 sap, inner bark, tea; S28 Algonquin Quebec food use, Ojibwa beverage