Swamp White Oak
Quercus bicolor
Last reviewed: October 2026
Swamp white oak is a large deciduous tree suited to full sun and wet to consistently moist soils, often found in floodplains and bottomland forests across the northeastern and midwestern United States. It blooms in April and May with inconspicuous greenish flowers.
Swamp White Oak (Quercus bicolor) is not on the ASPCA Animal Poison Control Center toxic plant list for dogs or cats (aspca.org (opens in new tab), last reviewed 2026-05-21). If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.
The USDA PLANTS Database (opens in new tab) does not flag Swamp White Oak as toxic to livestock.
Light
full sun
Water
high
Size
240"–600" H × 300"–600" W
Bloom
Apr, May
Native to
AL, CT, DE, IA and 22 more states
Pollinators
bees, beetles
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Swamp white oak is a large, stately native tree with distinctive rounded lobes on its leaves and attractive exfoliating bark. It grows 20-50 feet tall with a broad, spreading crown and tolerates both wet and dry conditions once established. This long-lived oak produces acorns that are an important food source for wildlife.
Growing Swamp White Oak
Grow Swamp White Oak in full sun and high water. Mature plants reach 240 to 600 inches tall and spread 300 to 600 inches wide. Expect low maintenance to keep it looking intentional in a front yard.
How to care for Swamp White Oak, by region
How to care for Swamp White Oak where it is actually grown: year-round basics plus what to do each season, region by region, with the sources for each.
Care guidance last updated: October 2026
Atlantic Coastal Pine Barrens (includes Riverhead, NY)
Year-round
A big, tough oak that suits Long Island yards if it is watered well while young.
- Plant it in full sun, at least 6 hours of direct light a day.
- It grows in clay, loam or sand and tolerates heat and drought, but it is sensitive to salt, so keep it away from road spray and salty ground.
- Water a new tree deeply, about once a week in dry spells, and every two weeks if rain is enough.
- Use a two to three inch layer of mulch around new trees to hold moisture.
Fall
Fall watering sets the tree up for winter.
- Mid August through September is the most important time to prepare plants for winter stress.
- A tree planted this year needs water about once every four weeks in its first autumn.
- In the second year, water about once every five weeks in autumn.
- Acorns ripen September through October, with a good crop every 3 to 5 years.
Winter
Winter is when to prune, and plants should go in with plenty of moisture.
- Prune oaks in winter, not in the growing season.
- Plants should enter winter with ample moisture because frozen ground blocks water uptake and winter sun and wind keep drying them.
- Oak wilt can spread when firewood from an infected tree is moved, so do not move firewood.
- Send samples of oaks with suddenly wilting leaves through the Cornell Plant Disease Diagnostic Clinic.
Spring
Spring is for watering a young tree and leaving the saw alone.
- In the second year, water about once every four weeks in spring.
- Oak wilt is contagious during warm months from April to November, so avoid fresh cuts in that window.
- The state asks homeowners to prune oaks in winter, not during the growing season.
- It tolerates spring flooding, so wet spring soil is fine.
Summer
Summer water is the main job for a young tree.
- In the second year, water about once every three weeks in summer.
- For a first-year tree, water deeply at least once a week during dry spells.
- Water deep and infrequent, not a little every day.
- Established trees tolerate heat and drought.
Sources: NC State Extension Plant Toolbox, Quercus bicolor, Cornell Cooperative Extension Suffolk, Watering Trees and Shrubs on Long Island, Cornell Cooperative Extension Suffolk, Prune Your Oak Trees in Winter, Cornell Chronicle, Oak wilt found in six new New York locations
Eastern Corn Belt Plains (includes Columbus, OH)
Year-round
A sturdy shade tree for a Columbus yard with room to grow. It likes sun and moist soil but copes with dry spells.
- Plant it in full sun, at least 6 hours of direct light a day.
- It prefers moist to wet acidic soil but adapts to drier sites, and chlorosis (yellow leaves with green veins) can show up when soil pH is too high.
- It is hardy in USDA zones 4a to 8b and grows 50 to 60 feet tall and wide, so give it space.
- It is hard to transplant and establish, so buy a small tree and be patient.
Fall
Fall brings color and acorns, and a last drink for young trees.
- Fall color ranges from brown and copper to gold and red.
- Acorns ripen September through October, with a good crop every 3 to 5 years.
- Water newly planted trees late into the season while their roots are still growing, and only when it is above 40 F.
- Stop watering once the ground freezes, because trees cannot take up water from frozen soil.
Winter
Winter is the best window for pruning an oak.
- Winter is the time Ohio State recommends for pruning oaks, since it lowers oak wilt risk.
- Only prune where you need clearance, such as lower branches over a walk or drive.
- Stop supplemental watering when the ground is frozen.
- Keep road salt away from the trunk area, since the tree is sensitive to salt.
Spring
Spring is for watching the soil and keeping the pruning saw away.
- Do not prune oaks in April, May and June, because fresh cuts attract beetles that can carry the oak wilt fungus.
- Ohio State recommends pruning oaks in winter to lower oak wilt risk.
- It tolerates spring flooding, so a wet spring spot is not a problem for it.
- Leaf spots, anthracnose and rust can appear, and the page says none are serious.
Summer
In summer it mostly takes care of itself once it is settled in.
- It is tolerant of heat and drought and handles fairly dry summers.
- It is sensitive to soil compaction, so keep heavy foot and equipment traffic off the root area.
- Caterpillars, leaf miners and oak lace bugs may chew on leaves, and the page says none are serious.
- Some sources extend the no-pruning window through July to protect against oak wilt.
Sources: NC State Extension Plant Toolbox, Quercus bicolor, Purdue Extension, Winter Water, University of Illinois Extension, Don't prune oaks now, Ohio State BYGL, oak wilt and winter pruning posts
In an HOA neighborhood
Swamp White Oak is an HOA-friendly choice. Maintenance level: low. Tidiness: 4 out of 5.
Works well in: front yard, street edge, mid zone.
- Large mature size requires adequate space
- Seasonal acorn drop may need cleanup
Wildlife value
Host plant for white-marked tussock moth, gypsy moth.
Supports over 500 species of butterflies and moths as caterpillars, plus provides nectar for bees and beetles during spring blooms. Acorns feed squirrels, deer, and numerous bird species including woodpeckers, jays, and turkeys.
Common questions
- When does swamp white oak bloom?
- Swamp white oak blooms in April and May, with small greenish catkins appearing as the leaves begin to unfold.
- How much light does swamp white oak need?
- It grows best in full sun but can tolerate part sun or light shade, particularly while young and establishing.
- How much water does swamp white oak need?
- This tree prefers wet to consistently moist soils and is often seen along floodplains and low, poorly drained sites, though it also handles medium moisture once established.
- What insects are drawn to swamp white oak?
- Bees and beetles are commonly seen visiting the tree's catkins for pollen in spring.
- Does swamp white oak keep its leaves in winter?
- No, it is a deciduous tree and drops its leaves each fall, though some young trees hold marcescent leaves into winter.
- Is Swamp White Oak toxic to dogs?
- Swamp White Oak is not on the ASPCA Animal Poison Control Center toxic plant list for dogs (aspca.org).
- Is Swamp White Oak toxic to cats?
- Swamp White Oak is not on the ASPCA Animal Poison Control Center toxic plant list for cats (aspca.org).
- Is Swamp White Oak toxic to livestock?
- The USDA PLANTS Database does not flag Swamp White Oak as toxic to livestock.
- Is Swamp White Oak HOA-friendly?
- Swamp White Oak is generally an HOA-friendly choice in the right placement, with low maintenance.
These answers were drafted with an AI model from this plant's data. Verify care details with a local expert.
Native range data from vouchered herbarium specimen records and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
If something looks wrong
Common plant problems, and what to check first
These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.
- It is dying right after planting
- Leaves turning yellow
- Wilting even though I watered it
- Brown crispy leaf tips
- Bugs on the plant
Ready to grow Swamp White Oak? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.