When does American sycamore bloom?

American sycamore produces small, inconspicuous flowers in April and May before the leaves fully expand.

What insects visit American sycamore flowers?

Beetles and flies have been observed visiting the flowers, though the tree also relies heavily on wind for pollen movement.

How much water does American sycamore need?

This tree grows best with consistent, medium to high soil moisture and is commonly found along streambanks and floodplains where water is abundant.

What kind of light does American sycamore prefer?

It grows best in full sun but can tolerate some partial shade, especially when young or growing beneath a more open canopy.

Does American sycamore lose its leaves in winter?

Yes, it is a deciduous tree that drops its large lobed leaves in autumn, revealing its distinctive mottled bark.

Is Buttonball toxic to livestock?

The USDA PLANTS Database does not flag Buttonball as toxic to livestock.

Is Buttonball HOA-friendly?

Buttonball takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

Buttonball

Name: Pollinator Patch
Author: Pollinator Patch

Platanus occidentalis

Last reviewed: September 2026

American sycamore is a large deciduous tree that grows along rivers, floodplains, and lowland areas across much of the eastern and central United States. It blooms in April and May and does best in full sun with medium to high soil moisture.

Toxicity unknown

Buttonball (Platanus occidentalis) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. 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 Buttonball as toxic to livestock.

Light

full sun

Water

medium

Size

600"–1200" H × 300"–600" W

Bloom

Apr, May

Native to

AL, AR, CT, DE and 29 more states

Pollinators

beetles, flies

Before you buy

Your city may pay you to plant this

Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 452 programs across 44 states, each with a link to the provider and the date we last checked it.

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Browse plants for this ecoregion

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American sycamore is a massive native shade tree that can reach 50-100 feet tall with distinctive mottled bark that peels to reveal white, tan, and gray patches. It produces round seed balls and large maple-like leaves that turn yellow-brown in fall. This tree needs plenty of space and is best suited for large properties.

Growing Buttonball

Grow Buttonball in full sun and medium water. Mature plants reach 600 to 1200 inches tall and spread 300 to 600 inches wide. Expect high maintenance to keep it looking intentional in a front yard.

In an HOA neighborhood

Buttonball takes more care to keep looking intentional in a front yard. Maintenance level: high. Consider it for backyard or mid-zone beds rather than the street edge.

Works well in: backyard only.

Extremely large size inappropriate for most residential lots
Drops large amounts of leaves, bark, and seed balls creating maintenance issues
Shallow root system can damage sidewalks and foundations

Wildlife value

Supports beetles and flies during its spring bloom period. The large size and longevity make it valuable habitat for birds and other wildlife.

Common questions

When does American sycamore bloom?: American sycamore produces small, inconspicuous flowers in April and May before the leaves fully expand.
What insects visit American sycamore flowers?: Beetles and flies have been observed visiting the flowers, though the tree also relies heavily on wind for pollen movement.
How much water does American sycamore need?: This tree grows best with consistent, medium to high soil moisture and is commonly found along streambanks and floodplains where water is abundant.
What kind of light does American sycamore prefer?: It grows best in full sun but can tolerate some partial shade, especially when young or growing beneath a more open canopy.
Does American sycamore lose its leaves in winter?: Yes, it is a deciduous tree that drops its large lobed leaves in autumn, revealing its distinctive mottled bark.
Is Buttonball toxic to livestock?: The USDA PLANTS Database does not flag Buttonball as toxic to livestock.
Is Buttonball HOA-friendly?: Buttonball takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

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.

See all plant problem guides

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