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 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.

Swamp White Oak

Name: Pollinator Patch
Author: Pollinator Patch

Quercus bicolor

Last reviewed: September 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.

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.

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