This species rare in cultivation is the southernmost growing of all butterworts. The distribution of P. antarctica ranges from Tierra del Fuego in southern Chili to 48° southern latitude. Plants are growing in different habitats, namely bogs, together with peat moss, on wet bare rocks or on wet soils under pine trees. There is little knowledge about the ecology of this species. In culture rosettes reached a size up to 4 cm, consisting of up to 10 leaves.

By the end of June a single flower appeared. To my knowledge there was never published a picture of the flower of this species before, so I was quite curious to see how it looked. The corolla is bilabiate (has two lips) and corolla lobes are white. The form of the lobes reminds me of P. pumila. The corolla tube shows a linear violet veination. The spur is short and obtuse. It is not clear if this species is self-pollinating or not (I have not pollinated the flower by myself, but nevertheless seed has been formed. I have not observed if any pollination by insects occured). Seed was highly fertile.

As all other temperate butterwort species of South-America occuring along the Andean mountains, plants do not form hibernacula. Therefore P. antarctica belongs to the temperate-homophyllous growth type.