The population at Grytviken was mapped this season with approximately 3.5ha recorded. A small plant was found at the top of Cardiac hill on the track to Maiviken and the 100 sq m patch next to a waterfall below this hill. The Ocean Harbour had approximately 5000 sq m. Further populations were in Husvik, Stromness and Leith. (Floyd, K. (2013) Weeds on South Georgia. Government of South Georgia and the South Sandwich Islands.); Several new sites at Stromness Bay and on the Barff Peninsula and a large area contained Sheep sorrela at Grytviken. (Government of South Georgia and the South Sandwich Islands (2015) Alien plants on South Georgia: Season Report 2014-2015. Government of South Georgia and the South Sandwich Islands.); Widespread naturalised. Follow-up control on all sites (the majority of which were first controlled in 2015/16) was undertaken with an increased number of seedlings noted and many plants in flower and setting seed. New sites were found at Ocean Harbour, on the track between Grytviken and King Edward Point, and on bluffs behind Grytviken. (Floyd, K. (2018) Non-native plants on South Georgia: Season Report 2017/18. Indigena Biosecurity International, Government of South Georgia and the South Sandwich Islands);
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Terrestrial
James, R., Floyd, K., Pagad, S. & Wong, L.J. (2020) Global Register of Introduced and Invasive Species of South Georgia and the South Sandwich Islands. Version 1.4. Invasive Species Specialist Group ISSG. Checklist dataset; Greene, S.W. & Walton, D.W.H. (1975). An annotated checklist of the sub-Antarctic and Antarctic vascular flora, Polar Record, 17(110), pp. 473, 484.; Floyd, K. (2013) Weeds on South Georgia. Government of South Georgia and the South Sandwich Islands.;Government of South Georgia & the South Sandwich Islands (2016) South Georgia Non-Native Plant Management Strategy 2016-2020. Government House, Stanley, Falkland Islands.; Government of South Georgia and the South Sandwich Islands (2015) Alien plants on South Georgia: Season Report 2014-2015. Government of South Georgia and the South Sandwich Islands.; Floyd, K. (2018) Non-native plants on South Georgia: Season Report 2017/18. Indigena Biosecurity International, Government of South Georgia and the South Sandwich Islands;