Pin Oak
Quercus palustris
A magnificent native oak prized for its distinctive pyramidal shape and reliable, brilliant red-orange fall color that lasts for weeks. The Pin Oak's unique branching pattern—upward angled upper branches, horizontal middle branches, and downward lower branches—creates an instantly recognizable silhouette. Fast-growing for an oak and extremely tolerant of urban conditions, it provides excellent shade while supporting wildlife with its abundant acorn production.
Sun
Full sun to partial shade
Zones
4–8
USDA hardiness
Height
50-70 feet
Planting Timeline
Showing dates for Pin Oak in USDA Zone 7
All Zone 7 shade-tree →Zone Map
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Pin Oak · Zones 4–8
Growing Details
Zone-by-Zone Planting Calendar
Complete Growing Guide
Light: Full sun (6 or more hours of direct sunlight a day), Partial Shade (Direct sunlight only part of the day, 2-6 hours). Soil: Clay, Loam (Silt), Sand. Soil pH: Acid (<6.0). Drainage: Good Drainage, Moist, Occasionally Dry, Occasionally Wet. Height: 50 ft. 0 in. - 70 ft. 0 in.. Spread: 40 ft. 0 in. - 60 ft. 0 in.. Spacing: more than 60 feet. Growth rate: Rapid. Maintenance: Medium. Propagation: Seed. Regions: Coastal, Mountains, Piedmont.
Harvesting
1/4-1/2-inch acorns are round and short-stalked occurring singly or in clusters of 2-3, from light brown to reddish-brown with a shallow and thin cup. The fruits are initially green and then tan. The cap is thin and smooth and covers 1/4 to 1/3 of the fruit. Displays from October to November. It may take up to 15 to 20 years before the tree produces acorns.
Color: Brown/Copper, Red/Burgundy. Type: Nut. Length: < 1 inch. Width: < 1 inch.
Garden value: Showy
Harvest time: Fall
Edibility: Acorns (nuts) are edible after tannins are leached or boiled out
Storage & Preservation
Pin Oak is a shade tree, not a food crop—storage and preservation methods don't apply in the traditional sense. However, seeds (acorns) can be stored in cool, moist conditions (32-40°F) for short-term viability over winter. Acorns should be kept in slightly damp sand or peat moss to prevent drying out. Long-term preservation is challenging; stratification (cold, moist treatment) for 30-60 days improves germination rates if propagating new trees. Fresh acorns are best sown immediately or stored refrigerated for up to a few months.
History & Origin
Origin: South Ontario to North Central & Eastern U.S.A
Advantages
- +Attracts: Butterflies, Moths, Pollinators, Small Mammals, Songbirds
- +Edible: Acorns (nuts) are edible after tannins are leached or boiled out
- +Fast-growing
Considerations
- -Toxic (Fruits, Leaves): Low severity
Companion Plants
Pin Oak does well with acid-loving understory plants — azalea, rhododendron, and blueberry all prefer the same 5.0–6.0 pH range the tree reinforces through years of leaf litter decomposition. Planting them within the dripline means they're working with the soil chemistry rather than fighting it. Ferns, hosta, wild ginger, and coral bells fill in the shaded ground beneath the canopy where lawn grass gives up anyway — none of them compete for the oak's light, and their shallow roots stay clear of the deeper water the tree is pulling.
Lawn grass is a subtler problem than it looks: turf competes hard for moisture in the top 12 inches of soil and typically brings along regular lime and fertilizer applications that push pH above 6.5 — exactly what triggers iron chlorosis in Pin Oak. Black walnut is the harder constraint; it produces juglone, a root-zone compound that suppresses many plants outright, and Pin Oak planted within 60 feet of one tends to show stress that's easy to misread as disease or iron deficiency.
Plant Together
Azalea
Both thrive in acidic soil conditions that Pin Oak naturally creates
Rhododendron
Tolerates acidic soil and partial shade created by Pin Oak canopy
Blueberry
Benefits from acidic soil conditions and partial shade protection
Fern
Thrives in the moist, shaded understory conditions beneath Pin Oak
Hosta
Excellent shade tolerance and complements Pin Oak's understory environment
Wild Ginger
Native groundcover that thrives in acidic woodland conditions
Serviceberry
Compatible native understory tree that tolerates Pin Oak's root competition
Coral Bells
Shade-tolerant perennial that handles acidic soil well
Keep Apart
Black Walnut
Produces juglone toxin that can damage Pin Oak's root system
Sugar Maple
Competes aggressively for nutrients and creates dense shade that Pin Oak cannot tolerate
Tomato
Cannot tolerate the deep shade and acidic soil conditions under Pin Oak
Lawn Grass
Competes heavily for surface water and nutrients, struggles in Pin Oak's acidic leaf litter
Pests & Disease Resistance
Resistance
Generally healthy, may develop chlorosis in alkaline soils
Common Pests
Gypsy moth, oak leafroller, scale insects, oak gall wasps
Diseases
Oak wilt, anthracnose, powdery mildew, iron chlorosis in high pH soils
Troubleshooting Pin Oak
What you'll see, why it happens, and what to do about it.
Leaves turning yellow between the veins (interveinal chlorosis), starting on newer growth, often noticed in summer
Likely Causes
- Iron chlorosis — Pin Oak is notoriously sensitive to high soil pH (above 6.5), which locks out iron even when it's present in the soil
- Soil pH crept up from lime applications, concrete leaching, or naturally alkaline parent material
What to Do
- 1.Test your soil pH first — don't guess. A simple kit or county extension test will confirm it.
- 2.Acidify with elemental sulfur worked into the root zone, or switch to an acidifying fertilizer like ammonium sulfate; NC State Extension recommends targeting pH 5.5–6.0 for Pin Oak
- 3.For a faster fix on an established tree, have a certified arborist inject chelated iron directly into the trunk or soil — foliar sprays don't move the needle on a 50-foot tree
Wilting and rapid browning starting at branch tips and spreading inward — tree looks scorched; can kill a mature tree within a single growing season
Likely Causes
- Oak wilt (Bretziella fagacearum) — a fungal vascular disease spread by sap beetles and through root grafts between nearby oaks
- Fresh pruning wounds left exposed during the April–July beetle flight period
What to Do
- 1.Don't prune oaks between April 1 and July 31 — that's the highest-risk window for beetle transmission; schedule major cuts for late fall or winter
- 2.If oak wilt is confirmed (usually requires a lab sample sent to your state plant diagnostic lab), remove and chip or bury infected wood immediately — don't store it as firewood near healthy oaks
- 3.Trench or use a vibratory plow to sever root grafts between the infected tree and its neighbors before removal
Brown, papery patches on leaves in spring, often following a cool wet May; lower canopy hit hardest
Likely Causes
- Anthracnose (Discula quercina or related species) — a fungal disease that thrives when temps stay below 60°F during leaf-out
- Dense canopy with poor airflow, or trees sited in low-lying areas where moisture lingers
What to Do
- 1.On a healthy, established Pin Oak, do nothing — anthracnose is mostly cosmetic and the tree pushes new leaves by midsummer without lasting damage
- 2.Rake and dispose of infected leaf litter in fall to cut down the spore load the following spring
- 3.If a young tree (under 10 years old) is getting hit hard two or three years running, a single copper-based fungicide spray at bud break can reduce severity — time it to when leaves are just unfurling
Frequently Asked Questions
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Growing Guides from Wind River Greens
Where to Buy Seeds
Sources & References
External authority sources used in compiling this guide.
- ExtensionNC State Extension
See the Methodology page for how this data is sourced, what's AI-assisted, and known limitations.