Tree · Betulaceae
Paper Birch
Betula papyrifera
Give it a cool, moist root run and paper birch holds its brilliant, chalk-white peeling bark for decades.
Full sun
Every 3–7 days
USDA 2–7
50–70 ft · 15.2–21.3 m
Overview
The paper birch is best known for its bright white bark, thin and papery, that lifts at the edges and peels away from the trunk in loose, curling strips. Beneath the outer layer the fresh bark shows pale, and the surface is marked with the dark horizontal streaks typical of a birch. It is a fast-growing native of the far north, spread clear across the continent through the cold woods of Canada and the northern states, and its waterproof bark was once peeled in wide sheets by Indigenous peoples to build canoes, the source of the name canoe birch.
This cold-country tree grows fast and straight, its slender white trunk often climbing 50 to 70 feet (15 to 21 meters) before the crown of fine, dark twigs branches out overhead. In spring the bare twigs hang with long, drooping catkins, and the leaves that follow are toothed and pointed, unfurling a clean green. It stands unbothered through brutal winters but weakens where summers run hot and dry, and it holds its form for decades rather than centuries.
One creature marks the tree more than any other: the bronze birch borer, whose larvae leave D-shaped holes and raised ridges scored into the smooth white bark of a stressed tree. Keep the roots cool, the soil moist, and the trunk vigorous, and the pale bark stays clean and unbroken.
Care
The short version: full sun, cool and evenly moist slightly acidic soil, a thick blanket of mulch over the roots, and steady water through heat and drought keep the white-barked trunk sound and the borer out.
Light
Paper birch wants full sun and will not hold up in shade for long, since it is a pioneer that races into open, sunlit clearings. It takes a little partial sun, but the more light that reaches the trunk, the whiter and cleaner the bark and the stronger the tree.
Water
The soil should stay cool and evenly moist, because this tree cannot bear to dry out. Water deep through heat and drought and lay mulch over the roots to hold the cool, since drought stress opens the smooth bark to the bronze birch borer. Dry, packed ground starves it.
Soil
Give it moist, well-drained, sandy or silty loam that leans acidic. A pH between 5.0 and 6.5 keeps the green leaves full and healthy; drift much higher and they pale and yellow with chlorosis.
Temperature
This is a cold-hardy tree to the core, its bare white trunk standing through winters down to -49°F (-45°C) unharmed. Heat is the strain, and it falters once summers push past about 86°F (30°C).
Humidity
Everyday outdoor humidity suits it, so there is no figure to reach. What counts more is good airflow moving through the crown of fine twigs, which dries the leaves and keeps leaf-spot fungi from settling in a wet season.
Feeding
A balanced tree fertilizer in spring keeps a paper birch vigorous, and that vigor is what keeps the borer out of the bark. Feed through the season as needed to hold the tree strong.
Pruning
Pruning falls in summer through early fall, well away from late winter and early spring, when a fresh cut weeps clear sap heavily down the bark. Cut out the dead and borer-ridged branches as they show.
Repotting
not applicable - landscape tree
Size & spacing
This is a large tree, its white trunk reaching 50 to 70 feet (15 to 21 meters) tall with a crown spreading roughly 30 to 35 feet (9 to 11 meters) across. Give it open room and a spot where the roots stay cool and shaded.
When to plant
Paper birch is a cold-climate tree, suited to the northern zones where summers stay mild. It goes into the ground in the cool of spring or fall, and its long, dangling catkins open on the bare twigs in spring, around April to May.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Spring or fall
- Harvest: Catkins in spring (April to May)
Hardiness
USDA hardiness zones: 2–7
Temperature: down to -46°C
Troubleshooting
Most of what goes wrong on a paper birch shows first in the bark and the leaves, the two surfaces worth studying closely. Watch the crown thin at the top and the green leaves spot or curl through the season, and step in early, since the gravest trouble begins quietly overhead.
Uppermost branches browning and bare, the bark pocked with tiny D-shaped holes
Thin, dying twigs at the very top of the tree, paired with small holes shaped like a capital D punched through the white bark, mark the bronze birch borer, the worst enemy a paper birch has. The pale larvae bore under the bark and wind out sawdust-packed galleries that sever the water flow, so the crown browns and dies downward. Only a stressed tree gives them a foothold, so cool roots, steady moisture, and clean removal of the ridged, swollen branches keep the trunk whole.
Fix:
- Prune out and destroy infested and dead branches
- Reduce stress by watering deeply and mulching to cool the roots
- Apply a registered insecticide when adults are active in June
- Maintain tree vigor; larvae do not survive in healthy trees
Brown-speckled leaves by midsummer, falling early and thin
Brown spots and ragged blotches spreading across the leaves by July are the sign of Marssonina leaf spot and anthracnose, fungi that swell in a wet season and can leave the branches bare by late summer. Fallen, spotted leaves hold the spores over the winter, so they get raked up and burned, and a thinned canopy dries the wet foliage the fungi need. Even stripped of leaves, a vigorous tree flushes a fresh green canopy the following spring.
Fix:
- Rake and destroy fallen infected leaves
- Improve air circulation and avoid overhead wetting
- Keep tree vigorous with proper watering and mulch
Whitish-green blotches on the leaf blades bruising to brown
Whitish, light-green patches that darken into brown, kidney-shaped mines between the upper and lower leaf surfaces are the tracks of the birch leafminer. Tilt a leaf toward the sun about ten days after bud break and the small larvae show as dark specks trapped inside the hollowed tissue. The blotches look scorched, yet the harm runs no deeper than the leaf skin, and a well-watered tree carries its green canopy right through the season.
Fix:
- Treat with a registered systemic insecticide when larvae first hatch and begin feeding
- No control is needed once large brown blotches appear, as larvae have already left
Corrugated, yellow-tinged leaves varnished in sticky honeydew
Leaves that pucker into corrugated ridges, yellow at the edges, and shine with a sticky glaze are carrying aphids clustered on the tender new growth. The small soft-bodied insects mass along the stems and leaf undersides, and light numbers barely mark the tree. The lady beetles that arrive usually thin them out, and a firm jet of water knocks a heavy colony off the curled leaves.
Fix:
- Tolerate light infestations, as natural predators usually provide control
- Wash off heavy infestations with a strong stream of water
Toxicity
For a home with pets or grazing animals, the paper birch is not toxic to any of them. Nothing in the green leaves, the slender twigs, the papery white bark, or the clear sap carries poison, and the spring sap is even tapped and boiled down into birch syrup. A curious nibble brings a mild, passing stomach upset at most.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Nothing in the leaves, twigs, or papery bark of a paper birch will poison a cat. A curious nibble on a fallen curl of bark might draw a little drool or a mild stomach upset, the same as any plant a cat should leave alone, and that is the whole of it.
Dogs None
A dog is in the clear around paper birch. Chewing a dropped twig or a strip of the white bark holds no poison, though a big mouthful of the green leaves can loosen the stomach for a day.
Horses Safe
Paper birch is safe for horses, and the leaves and slender twigs are sometimes browsed off the low branches without harm. No toxin sits in the wood, bark, or foliage on pasture or along a paddock fence.
Rabbits Safe
Rabbits gnaw the smooth bark and thin twigs without any danger. Wild rabbits and hares strip the pale bark from young birch through winter as a matter of course, and the tree holds no poison for them.
Livestock Safe
Cattle, goats, and sheep browse the leaves and twigs of paper birch with no ill effect. Neither the bark nor the foliage carries a toxin, so an animal cropping the lower branches is fine.
Birds Safe
Birds are safe around paper birch, and many live off it, prying seeds from the ripe catkins and pecking insects from the peeling bark. The tree poses no risk to them.
People Safe
Paper birch is safe for people, with no poisonous parts. The clear spring sap is even tapped from the trunk and boiled down into birch syrup, much the way maple sap is.
No special handling required; ingestion of plant material may still cause mild stomach upset in pets.
Varieties
Most paper birch grown for the landscape is the plain wild species, though a couple of named selections stand out for the brightness of their bark and their hardiness.
Renaissance Reflection
A selection prized for exceptionally bright white bark and stronger vigor, and it stands up to the bronze birch borer better than the wild tree.
Varen (Prairie Dream)
A cold-hardy selection carrying bold, chalk-white bark, bred to hold its color and form in the harsh, exposed landscapes of the far north.
How to propagate
Paper birch grows almost entirely from its tiny winged seed, since cuttings rarely take.
SeedModerate
Sow in fall or after cold stratification in spring · 1 to 2 growing seasons
Seed is the standard way to raise a paper birch. The seeds are tiny, winged flecks shed from the ripe catkins, sown in fall or cold-stratified and sown in spring onto bare, moist mineral soil that lets the light reach them. A young seedling takes one to two growing seasons to root in and stand on its own.
Stem cuttingsDemanding
Summer (softwood) · Variable; often unreliable
Cuttings rarely take with paper birch. The soft green shoots cut in summer form roots poorly and end up unreliable at best, which is why growers fall back on the winged seed instead.
Myths
Paper birch takes to any yard as effortlessly as a river birch.
These two birches are not interchangeable. Paper birch, with its smooth white peeling bark, falls to the bronze birch borer far more readily than the shaggy, salmon-brown river birch, and at heart it belongs to cold country. In a hot, dry, or compacted city site it struggles and dies young, while river birch takes that heat in stride.