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Flowering dogwood: mature size, roots and how far from the house to plant it
Flowering dogwood, Cornus florida: 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.
Flowering dogwood grows 15–25 ft tall and 15–30 ft wide, per NC State Extension. Plant it at least 15 ft from the house, 4 ft from a patio or driveway, 30 ft from a septic field and 20 ft from a sewer line. It stays under 25 ft, so it can go near 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.
Flowering dogwood facts
| Mature height | 15–25 ft |
|---|---|
| Mature width | 15–30 ft |
| Size class | Small |
| Growth rate | Medium |
| Hardiness zones | 5a–9b |
| Light | Full sun (6 or more hours of direct sunlight a day) |
| Soil | Clay; Good Drainage |
| Form | Ascending |
| Origin | South Eastern Canada, Eastern North America, to Eastern Mexico |
| Fall color | Purple/Lavender |
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.
Flowering dogwood roots
Dogwoods are named among less aggressive trees for drain fields (Clemson, quoted by UMaine). On PPL’s small-tree list.
How far to plant flowering dogwood from things
| From | Plant at least | The rule |
|---|---|---|
| House or building | 15 ft | Half the mature canopy width (eXtension) |
| Patio, driveway or walk | 4 ft | At least 4 ft for any tree (Morton Arboretum); 4 to 10 ft of rooting area suits small trees (Iowa State) |
| Septic drain field | 30 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 | OK under lines | Trees under lines should stay under 25 to 30 ft (WV Forestry) |
| Retaining wall | 15 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 small trees
15–25 ft tall, 10–25 ft wide. Plant 13 ft from the house.
15–25 ft tall, 10–15 ft wide. Plant 8 ft from the house.
How to identify flowering dogwood
| Leaf type | Opposite, simple leaves with smooth edges |
|---|---|
| Leaves | Oval leaves 3 to 5 inches long with smooth or slightly wavy edges and veins that curve toward the tip. |
| Bark | Smooth gray when young, later breaking into small scaly blocks. |
| Fruit | Shiny red oval fruit 1/4 to 1/2 inch long in clusters of 3 to 5, ripe in fall. |
| Twigs | Slender green or purple twigs that turn gray. |
The Pennsylvania Natural Heritage Program (PNHP) lists flowering dogwood as native to Pennsylvania (it lists the species as Benthamidia florida).
Look-alikes: Pagoda dogwood, Blackhaw.
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 flowering dogwood get?
Flowering dogwood grows 15–25 ft tall and 15–30 ft wide at maturity, per NC State Extension. Growth rate: medium.
How far from the house should you plant flowering dogwood?
At least 15 ft, half of its 15–30 ft mature width, so the canopy clears the house. Keep it 4 ft from a patio or driveway.
Do flowering dogwood roots damage foundations, patios or pipes?
Dogwoods are named among less aggressive trees for drain fields (Clemson, quoted by UMaine). On PPL’s small-tree list.
What zones does flowering dogwood grow in?
Flowering dogwood is listed for USDA zones 5a–9b by NC State Extension. That includes zone 6, which covers most of central Pennsylvania.
Can flowering dogwood go under power lines?
Yes. It stays under 25 ft, which WV Forestry gives as the limit for trees under lines.
Sources: NC State Extension (Cornus florida); 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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