Supplementary Material

Appendix A. List of plants offered for sale by the surveyed retailers and the plant producers in 2016–2017 and in 2020. Plant families, taxon categories and confidence levels of identification are also given. Taxa of the Belgian Consensus and Communication Lists and the European Union List are indicated separately. *In 2020, surveys of retailers 2 and 3 were limited to submersed and floating plants and taxa of the Belgian Consensus and Communication Lists and the European List of Union Concern.

Appendix B. List of mislabelled plants encountered during the surveys of 2016–2017 and 2020. The erroneous names used on the labels are listed separately for each plant producer. The taxon categories, types of taxonomic errors and confidence levels of identification are also given. *Eichhornia crassipes was transferred to the genus Pontederia after the 2016-2017 surveys (Pellegrini et al., 2018) and was not offered for sale during the 2020 surveys.

© T. Van den Neucker and K. Scheers, Published by EDP Sciences 2023