The endangered species Charophyceae growing at Keihanna Commemorative Park was featured in The Mainichi Shimbun. The algae, now on the Red List of threatened species, used to be seen across the nation in ponds and paddy fields, but use of chemicals and modern land cultivation methods have led to near extinction. At Keihanna, rice is grown organically and in the traditional wet fields, so plants like Charophyceae can still grow in their natural habitat.