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River Birch
Betula nigra
River Birch is grown for its foliage rather than flowers, giving the garden structure and color all season long.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing River Birch
Plant it in full sun. It prefers high water. It is hardy in USDA zones 4–9. Expect it to reach about 49 ft tall and 39 ft wide at maturity, in roughly 20 years (not yet checked).
No toxicity note is on file for River Birch. That is not a clearance: check its safety for people and pets before planting.
What this means
Written with AI assistance and not yet checked plant by plant against recorded sources, so treat every fact above as a starting point. Its scientific name was checked against botanical registries, an audit keeps its values consistent with the rest of the library, and a July 2026 review re-read the main facts of every plant then in the library against horticultural authorities without recording a source for each, which is why none of that counts as checked here. The source-by-source check is working through the whole library in the open, and a checked plant says so in this row.
When to plant River Birch
Plant River Birch in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. In zone 6, the middle of its hardy zones 4 to 9, spring means March to May and fall means August or September.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 6, the middle of this plant's hardy range, start with zone 6 in March. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does River Birch get?
49 fttall5 ft 7 inan adult39 ftwideSee River Birch in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
How far apart to plant River Birch
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Give River Birch about 39 ft of clear ground in every direction, measured from its center. It is one plant with room around it, not a row, and a raised bed is too small for it.
Add River Birch to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
Good to know about River Birch
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note. A note reports what its source says; where that differs from a fact above, the fact above is this entry's stored value, and its mark says whether it has been checked.
Worth knowing
It shrugs off the bronze birch borer, the beetle that kills white-barked birches. In a 20-year trial river birch had 97% survival while every European white birch died. per Environmental Entomology and Morton Arboretum
Fall color is unreliable
It can turn bright gold, but far more often the yellow is dull and drops early and fast. Grow it for the bark, not for fall color. per Wisconsin and NC State
Yellow leaves on alkaline soil
It must have acidic soil. Above about pH 6.5, iron and manganese lock up and leaves yellow between green veins (chlorosis); acidify the soil to fix it. per Illinois and Clemson
Peeling bark, the main draw
The main ornamental feature: salmon to cinnamon young bark peels year-round in thin, papery, curling sheets, giving strong winter interest. Mature trunks turn darker and scaly. per NC State
Thrives in wet ground
A top pick for wet, low spots: it thrives in moist to wet ground and tolerates flooding, ideal for rain gardens, bioswales, and stream or pond edges. per Clemson
Messy; site it carefully
It is messy, constantly dropping twigs, branchlets, and papery bark that can clog gutters. Site it away from the house and patios, in naturalized or rain-garden spots. per Wisconsin
What pairs well with River Birch
Good companions share its growing conditions and add something it lacks: an earlier or later bloom, a lower carpet in front, or structure through winter.
Joe Pye Weed
Shares full sun and high water; its seed heads stand through winter, for structure and the birds; both are North American natives.
Perennial Sunflower
Shares full sun and moderate to high water; its seed heads stand through winter, for structure and the birds; both are North American natives.
Sneezeweed
Shares full sun and moderate to high water; its seed heads stand through winter, for structure and the birds; both are North American natives.
Arborvitae
Shares full sun and moderate to high water; evergreen, so the bed keeps its shape through winter; both are North American natives.
Douglas Fir
Shares full sun and moderate to high water; evergreen, so the bed keeps its shape through winter; both are North American natives.
Eastern White Pine
Shares full sun and moderate to high water; evergreen, so the bed keeps its shape through winter; both are North American natives.
Feather Reed Grass
Shares full sun and moderate to high water; its seed heads stand through winter, for structure and the birds.
Boxwood
Shares full sun and moderate to high water; evergreen, so the bed keeps its shape through winter.
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Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.