the deceptive practice of presenting an orchestrated marketing or public relations campaign in the guise of unsolicited comments from members of the public

cover (a sports field or other area) with a layer of Astroturf

the garden has been astroturfed for ease of maintenance

astroturfed tennis courts

disguise (an orchestrated marketing or public relations campaign) in such a way as to present it as having arisen from unsolicited public comments

there's a suspicion that he astroturfed the campaign behind the scenes

they alleged that the petition could have been astroturfed