Frederik Mortier, Ghent Universit, discusses his article: Polyploid—diploid coexistence in the greater duckweed Spirodela polyrhiza Polyploid establishment is not as easy as it looks Polyploidy, when organisms have extra sets of chromosomes due to whole-genome duplication, is surprisingly common, especially in plants. Polyploidy can be a dramatic mutation with a huge effect on plant traits,…