Fleabane’s Daily Exercise Program

Philadelphia fleabane, 17 May 2021 (photo by Kate St. John)

5 August 2021

Fleabane has a daily exercise regimen that responds to light.

Daisy fleabane, 30 June 2021 (photo by Kate St. John)

At sunset Philadelphia fleabane (Erigeron philadelphicus) and daisy fleabane (Erigeron annuus) close their ray petals and bow their heads. In the morning they raise their heads and open their petals, ready for insect pollination.

The process is called nyctinasty and is controlled by their circadian clocks.

Daisy fleabane opening in the morning (photo by Kate St. John)

Learn more about their exercise program and how to identify daisy and Philadelphia fleabane in this vintage article: The Bane of Fleas.

(photos by Kate St. John)

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