You do know that plant life in Antarctica has been there long before it was discovered in the 1930s.... right?
"The importance of such microclimates was demonstrated by the second Byrd Antarctic Expedition (1933–35), which found that lichens in Marie Byrd Land grow preferentially on darker-coloured heat-absorbing rock."
The article also details that there can be a month or two worth of "warm" weather - which allows plant life to flourish. The world isn't ending because there are flowers in Antarctica.