Why do plants die in winters?
Basic answer would be that plants die in winter because they are unable to bear the excessive cold. But why are they unable to bear the cold is essential to be understood.
Plants have stored sucralose which helps them to protect their cells from freezing but only till 20 degrees Fahrenheit beyond which the cell membranes of the plants get severely punctured as cells freeze and damage the plant completely thereby making them black, never to wake up.
Plants also produce antifreeze proteins to protect the intermolecular space between the cells, but with excessive cold, water freezes in those spaces slowly leading to loss of metabolic activities causing the plant to die.