Seen This Week: Sycamore Snow

American sycamore seed ball disintegrating at the end of winter (photo from Wikimedia Commons)

22 March 2025

As the weather warmed this month American sycamore (Platanus occidentalis) seed balls disintegrated to disperse their wind-driven seeds.

On 16 March it was very windy when I visited Herr’s Island back channel. Sycamore achenes (seed packets) blew by me in the wind and piled up in the cracks like snow drifts.

A single American sycamore seed, 16 March 2025 (photo by Kate St. John)

Sycamore snow.

Many sycamore seeds gathering like snow drifts, Herr’s Island, 16 March 2025 (photo by Kate St. John)

They had come from seed balls like these that had waited all winter for spring heat to make them stretch and burst.

Sycamore seed balls hanging like ornaments, 3 March 2018 (photo by Kate St.John)
Sycamore seed balls hanging like ornaments, 3 March 2018 (photo by Kate St.John)

Not only do they disperse on the wind but the fluff-tops have a second mode of transportation. They float.

Sycamore seeds swirling in the Allegheny River in Herr’s Island back channel, 16 March 2025 (video by Kate St. John)

Water carries them to their favorite habitats.

American sycamore is found most commonly in bottomland or floodplain areas, thriving in the wet environments provided by rivers, streams, or abundant groundwater.

Wikipedia American sycamore account

You’ll be able to identify American sycamores easily before leaf out. Look for the white upper trunks of large trees along stream and river banks.

Sycamores on the banks of Raccoon Creek, Beaver County, PA, 28 Feb 2018 (photo by Kate St.John)
Sycamores on the banks of Raccoon Creek, Beaver County, PA, 28 Feb 2018 (photo by Kate St.John)

One thought on “Seen This Week: Sycamore Snow

  1. Well!!! This was one heck of an informative and interesting post. Thank you, Kate, for all of the new information. I never knew this about sycamores. I love how the seed balls hang like ornaments!! I hope you are having a great weekend. You know I always appreciate when you give my old brain new information.

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