The Plumbago Blue (Leptotes plinius) is a small lycaenid butterfly whose larvae feed on the buds and flowers of native Wild Leadwort (Plumbago zeylanica) and cultivated Cape Leadwort (Plumbago auriculata). In Australia, the butterfly is currently understood to occur in eastern Queensland and New South Wales with sporadic records elsewhere. I observed the species extra-limitally in six locations, three in far western Queensland and three in the western Einasleigh Uplands. I also review other published and unpublished extra-limital observations. These observations fall into two categories, those in towns and gardens often explicitly associated with Cape Leadwort, and those in natural environments often explicitly associated with Wild Leadwort. I suggest two hypotheses for its extra-limital occurrence in natural environments: 1. that there may be rarely detected natural populations along watercourses across most of tropical Queensland, and 2. that these records might reflect dispersal from populations established in towns and gardens, the latter the result of transfer of eggs, larvae or pupae with nursery specimens of Cape Leadwort. Evidence is presented lending support to both hypotheses.