The 2021 Ecology primary took place on 19 and 28 September 2021 to nominate the candidate of the Ecologist Pole electoral coalition for the 2022 French presidential election.

The primary was open to any French citizen over the age of 16, who paid a small fee and agreed to the coalition's charter.

Several far-right figures, in particular Damien Rieu and Sébastien Chenu of the National Rally, announced that they wanted to disrupt the primary by encouraging people to vote for Rousseau, in order to stop Jadot winning the nomination.

To stop any interference, registration was done online on a dedicated platform, and required providing an email and phone number that could not be reused.

Although the reinstatement of her party allowed Jean-Marc Governatori to obtain sponsorships, Lepage said that she did not support any candidate in the first round.