Tree · Betulaceae
Paper Birch
Betula papyrifera
Give it a cool, moist root run and the paper birch rewards you with brilliant white bark for decades.
Full sun
Every 3–7 days
USDA 2–7
50–70 ft · 15.2–21.3 m
Overview
Few trees stand out in a winter landscape like the paper birch, with its bright white bark peeling away in papery curls. It's a fast-growing native of the far north, ranging clear across the continent through the cold woods of Canada and the northern states. Indigenous peoples once used that waterproof bark to build canoes, which is how it earned the name canoe birch.
This is a tree of cold places, hardy down to brutal winters but quick to suffer where summers run hot and dry. It grows fast and tall, often reaching 50 to 70 feet (15 to 21 meters), yet it doesn't live especially long, fading after several decades rather than centuries. Plant it where the soil stays cool and moist and it thrives; force it into a baking city lot and it tends to decline early.
The single thing that decides a paper birch's fate is the bronze birch borer, an insect that homes in on stressed trees. Keep the roots cool, the soil damp, and the tree vigorous, and you've done most of the work of growing one well.
Care
The short version: full sun with cool, evenly moist, slightly acidic soil, a thick layer of mulch to keep the roots cool, and steady water through heat and drought to fend off the borer.
Light
Paper birch wants full sun and won't tolerate shade for long, since it's a pioneer tree that races into open clearings. It will take a bit of partial sun, but the more light it gets, the better the bark and the stronger the tree.
Water
Keep the soil cool and evenly moist, because this is a tree that hates to dry out. Water deeply through heat and drought and lay down mulch to keep the root run cool, since drought stress is exactly what invites the bronze birch borer. It has no patience for dry, compacted ground.
Soil
Give it moist, well-drained, sandy or silty loam on the acidic side. A pH between 5.0 and 6.5 keeps it healthy; push much past that and the leaves yellow with chlorosis.
Temperature
This is a cold-hardy tree through and through, taking winters down to -49°F (-45°C) without flinching. It runs into trouble at the other end, struggling once summers push past about 86°F (30°C).
Humidity
Ordinary outdoor humidity suits it fine, so there's no number to hit. What matters far more is good airflow through the canopy, which keeps the leaf-spot fungi from taking hold in a wet season.
Feeding
A balanced tree fertilizer in spring keeps a paper birch vigorous, and vigor is its best armor against the borer. Feed it through the season as needed to hold that strength.
Pruning
Time your pruning for summer through early fall, and steer well clear of late winter and early spring, when fresh cuts bleed sap heavily. Take out dead and borer-infested branches whenever you find them.
Repotting
not applicable - landscape tree
Size & spacing
This is a large tree, climbing 50 to 70 feet (15 to 21 meters) tall with a spread of roughly 30 to 35 feet (9 to 11 meters). Give it plenty of open room and a spot where the roots can stay cool and shaded.
When to plant
Paper birch is a cold-climate tree, happiest in the northern zones where summers stay mild. Plant it in spring or fall while the weather is cool, and look for the dangling catkins to open 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
Nearly every paper birch problem ties back to stress and the pests that follow it. Watch the crown and the leaves through the season, and step in early, because the most serious trouble starts quietly at the top of the tree.
Crown dying back from the top with D-shaped holes in the bark
This is the bronze birch borer, the worst enemy a paper birch has. The larvae tunnel under the bark and cut off the flow of water, so the tree dies from the top down and leaves those telltale D-shaped exit holes. A tree under heat or drought stress is the one that gets hit, so the real defense is keeping it cool, watered, and vigorous, since the grubs can't survive in a healthy tree.
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 leaf spots by midsummer with early leaf drop
Spotting and blotching that shows up by July points to Marssonina leaf spot and anthracnose, fungi that flare in wet seasons and can strip the tree by late summer. Rake up and destroy the fallen leaves so spores don't carry over, and open the canopy for better airflow. A vigorous tree leafs out fine the next year even after a hard defoliation.
Fix:
- Rake and destroy fallen infected leaves
- Improve air circulation and avoid overhead wetting
- Keep tree vigorous with proper watering and mulch
Pale patches on leaves that brown into blotches
The culprit is the birch leafminer, whose larvae feed inside the leaf and leave kidney-shaped mines between the surfaces. Hold a leaf up to the light about ten days after bud break and you can spot the grubs at work. The damage looks rough but is mostly cosmetic, and a well-watered tree shrugs it off.
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
Puckered, yellowing leaves with sticky honeydew
Curled, corrugated leaves coated in a sticky film are the work of aphids feeding on the new growth. Light infestations rarely hurt the tree, and the ladybugs and other predators that show up usually settle it on their own. If a colony gets heavy, knock it back with a strong jet of water.
Fix:
- Tolerate light infestations, as natural predators usually provide control
- Wash off heavy infestations with a strong stream of water
Toxicity
Good news for a household with pets or grazing animals: paper birch is not toxic to anyone. There's no poison in the leaves, bark, twigs, or sap, and the spring sap is even tapped and boiled down into birch syrup. The most a curious nibble might cause is a mild, passing stomach upset.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
There's nothing in a paper birch that will poison a cat. A curious nibble might bring on a little drool or a mild stomach upset, the same as any plant a cat shouldn't be eating, and that's the worst of it.
Dogs None
Dogs are in the clear around paper birch. Chewing a fallen branch or some bark won't poison them, though a big mouthful of any leafy material can loosen the stomach for a day.
Horses Safe
Paper birch is safe for horses, and the foliage and twigs are sometimes browsed without harm. There's no toxin here to worry about on pasture or along a paddock fence.
Rabbits Safe
Rabbits can gnaw the bark and twigs without any danger. Wild rabbits and hares strip young birch in winter as a matter of course, and the tree holds no poison for them.
Livestock Safe
Cattle, goats, and sheep can browse paper birch with no ill effect. The leaves and bark carry nothing toxic, so a grazing animal that reaches the lower branches is fine.
Birds Safe
Birds are perfectly safe around paper birch. Many actually depend on it, feeding on the catkin seeds and the insects in the bark, and the tree poses no risk to them.
People Safe
Paper birch is safe for people, with no poisonous parts. The spring sap is even tapped and boiled down into birch syrup, much the way maple is.
No special handling required; ingestion of plant material may still cause mild stomach upset in pets.
Varieties
Most paper birch sold for the landscape is the wild species, but a couple of named selections stand out for bark and toughness.
Renaissance Reflection
A selection prized for its bright white bark and stronger vigor, with better resistance to the bronze birch borer than the wild type.
Varen (Prairie Dream)
A cold-hardy selection with bold white bark, bred to hold up in the tough, exposed landscapes of the far north.
How to propagate
Paper birch is grown almost entirely from seed, since cuttings rarely cooperate.
SeedModerate
Sow in fall or after cold stratification in spring · 1 to 2 growing seasons
Seed is the standard way to grow paper birch. Sow the tiny seeds in fall, or cold-stratify them and sow in spring, and give them light and bare, moist mineral soil to sprout on. A young tree takes one to two growing seasons to settle in.
Stem cuttingsDemanding
Summer (softwood) · Variable; often unreliable
Cuttings are a frustrating route with paper birch. Softwood cuttings taken in summer root poorly and the results are unreliable at best, which is why nearly everyone falls back on seed.
Myths
Paper birch is as easy and trouble-free in any yard as river birch.
These two birches are not interchangeable. Paper birch is far more prone to the bronze birch borer than river birch, and it's a cold-climate tree at heart. Plant it in a hot, dry, or compacted city site and it struggles and dies young, while river birch takes that heat in stride.