Dutch nurseries Van Senten and Aqua Look, which dominate nearly 90% of the European water hyacinth market, are contesting a European Commission ban on the plant, deemed an invasive species. The nurseries argue that the ban, potentially costing them millions in lost revenue, lacks sufficient scientific backing. They have taken their case to the Council of State, which may refer preliminary questions to the European Court of Justice to determine if the European Commission has adhered to the rules.