Hairy grass, pearl grass and moss. The Antarctic climate is cold, water molecules will not evaporate, and it basically does not rain. The water needed by Antarctic mosses and plants mainly comes from the melting of ice and snow. The shortest thawing days in warm period is only 20 days per year, and the longest one can reach about 100 days. If plants want to survive, they must survive 200 days of drought in a year.