Summary Pseudomonas aeruginosa is a ubiquitous Gram‐negative bacterium, which is also able to cause severe opportunistic infections in humans. The colonization of the host is importantly affected by the production of the high‐affinity iron (III) scavenging peptidic siderophore pyoverdine. The species P. aeruginosa can be divided into three subgroups (‘siderovars’), each characterized by the production of a specific pyoverdine...