The tallest parsley plant (Petroselinum crispum) was grown by David Brenner (USA) and reached a height of 2.37 m (7 ft 9.38 in) when measured at the North Central Regional Plant Introduction Station in Ames, Iowa, USA, on 10 June 2009.

Mr. Brenner, a Germplasm Curator at Iowa State University’s Department of Agronomy, originally planted the parsley plant in March 2008 to produce seeds to maintain the station’s seed bank.