Guide

Look closerPlants

Cattail seed heads and their winter fluff

November to March

Broadleaf cattails carry brown, sausage-shaped seed heads that stand through fall and winter, and a single head can hold more than two hundred thousand seeds. As the heads come apart, they turn into tan, cottony fluff that carries the tiny seeds on the wind.

Why this time of year

In fall and winter the marsh edge is mostly brown and the cattail heads stand out in the open. Some go to fluff in late fall and more come apart as winter goes on, while others hold their seeds until spring.

How to notice it

  1. Find a pond, marsh, or wet ditch edge with tall stiff leaves and brown, hot-dog-shaped heads, and look at them from the path or shore without stepping into wet ground.
  2. Compare heads: some are still dense and brown, and others are unkempt, tan, and cottony.
  3. Watch a fluffy head in a breeze and see the tiny seeds, each on its own fine hairs, drift off.
  4. Look for a bare stalk where the fluff has gone: it keeps the little stalks the seeds were attached to.

Try this with kids: Can you find one cattail head that is still a brown club and one that is turning into fluff? What does the fluff do when the wind blows?

Good to know: Each cattail seed is tiny and attached to long fine hairs, which work like a parachute in the wind.

Safety

  • Stay on solid ground and off thin ice at pond and marsh edges.

Sources

  • fs.usda.govUSDA Forest Service FEIS: 'an average of over 222,000 seeds/spike was produced'; seeds with long hairs blow in the wind and float; 'Often seeds remain attached to spikes through the winter and are dispersed in the spring.'
  • plants.sc.egov.usda.govUSDA NRCS Plant Guide: 'brown, fluffy, sausage-shaped flowering heads'.
  • minnesotawildflowers.infoMinnesota Wildflowers (regional botanical reference, secondary): 'The spikes can burst, allowing the seed to be carried off in the wind, or persist mostly intact through winter'; bare compound pedicels remain when fluff is gone.
  • westboroughlandtrust.orgWestborough (MA) Land Trust nature note 2021-11-19 (secondary, local): 'Now some are already going to fluff... As fall and winter progress, more and more will turn to fluff'; marshes, retention basins, pond edges.

Checked against these sources on October 2, 2026.

In the guide for November, December, January, February, March

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