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American sycamore: mature size, roots and how far from the house to plant it
American sycamore, Platanus occidentalis: how big it gets, what its roots do, and the planting distances to keep from a house, patio, septic field, sewer line and power lines, with a checker for your spot.
American sycamore grows 75–100 ft tall and 75–100 ft wide, per NC State Extension. Plant it at least 50 ft from the house, 10 ft from a patio or driveway, 100 ft from a septic field and 20 ft from a sewer line. It grows too tall for under power lines. Checked Nov. 13, 2026.
Is your spot far enough away?
| House | — |
| Patio, driveway or walk | — |
| Septic field | — |
| Sewer line | — |
| Power lines | — |
Measure from the trunk. The rules behind each number are in the table below. Your township, utility or septic permit can set its own setbacks.
American sycamore facts
| Mature height | 75–100 ft |
|---|---|
| Mature width | 75–100 ft |
| Size class | Large |
| Growth rate | Rapid |
| Hardiness zones | 4a–9b |
| Light | Full sun (6 or more hours of direct sunlight a day) |
| Soil | Clay; Good Drainage |
| Form | Dense |
| Origin | Southeastern Canada and Central to Eastern United States |
| Fall color | Brown/Copper |
From NC State Extension. Its zone range includes zone 6, which covers most of central Pennsylvania; check your own with our hardiness zone by ZIP tool.
American sycamore roots
On West Virginia’s surface-root list (sycamore).
How far to plant american sycamore from things
| From | Plant at least | The rule |
|---|---|---|
| House or building | 50 ft | Half the mature canopy width (eXtension) |
| Patio, driveway or walk | 10 ft | Large shade trees need at least 10 ft of rooting area (Iowa State) |
| Septic drain field | 100 ft | At least the root spread, estimated from mature height (Virginia Cooperative Extension), or the canopy width (University of Florida), and no closer than 20 ft for small trees (UMaine) |
| Sewer line or lateral | 20 ft | “Do not plant trees within 20 feet” of a sewer line (PA Water Environment Association) |
| Overhead power lines | 50 ft | Tall-growing trees at least 50 ft from lines (PPL Electric) |
| Retaining wall | 50 ft | At least 5 ft from the wall, with the canopy edge behind the wall (CMHA) |
Distances use the top of the size range, measured from the trunk. The full sources are in our tree planting distance guide.
Other large trees
50–70 ft tall, 30–50 ft wide. Plant 25 ft from the house.
40–60 ft tall, 35–45 ft wide. Plant 23 ft from the house.
60–75 ft tall, 40–50 ft wide. Plant 25 ft from the house.
60–70 ft tall, 40–50 ft wide. Plant 25 ft from the house.
60–75 ft tall, 60–75 ft wide. Plant 38 ft from the house.
50–80 ft tall, 100 ft wide. Plant 50 ft from the house.
How to identify American sycamore
| Leaf type | Alternate, simple leaves with lobes |
|---|---|
| Leaves | Wide leaves 4 to 8 inches across with 3 to 5 shallow lobes and coarse teeth; the base of the leaf stem covers the bud. |
| Bark | Patchy, peeling bark mottled brown, green, tan and white; older stems gray-brown and scaly. |
| Fruit | Round seed balls on stems 3 to 6 inches long, ripe in November and shed later. |
| Twigs | Stout, very zigzag orange-brown twigs. |
The Pennsylvania Natural Heritage Program (PNHP) lists American sycamore as native to Pennsylvania.
Identification notes from the Virginia Tech Dendrology fact sheet, in our own words; status from the PNHP PA Vascular Plant List. See all 140 trees in our Pennsylvania tree identification guide.
Questions
How big does american sycamore get?
American sycamore grows 75–100 ft tall and 75–100 ft wide at maturity, per NC State Extension. Growth rate: rapid.
How far from the house should you plant american sycamore?
At least 50 ft, half of its 75–100 ft mature width, so the canopy clears the house. Keep it 10 ft from a patio or driveway.
Do american sycamore roots damage foundations, patios or pipes?
On West Virginia’s surface-root list (sycamore).
What zones does american sycamore grow in?
American sycamore is listed for USDA zones 4a–9b by NC State Extension. That includes zone 6, which covers most of central Pennsylvania.
Can american sycamore go under power lines?
No. At 75–100 ft it outgrows the 25 ft limit for trees under lines; PPL says to plant tall-growing trees at least 50 ft from lines.
Sources: NC State Extension (Platanus occidentalis); planting distances from the sources in our tree planting distance guide: eXtension, Morton Arboretum, Iowa State, University of Florida, Virginia Cooperative Extension, UMaine, PA Water Environment Association, PPL Electric, WV Forestry and CMHA. Checked Nov. 13, 2026.
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