The ideal time to plant winter flowering pansies is during the fall, when soil temperature falls between 45 and 65 degrees Fahrenheit. This period ranges from September in northern states to October in the southern states. When planted during these months, pansies tend to flower through fall, winter and spring.
Fall planting allows adequate time for pansies to establish before winter hits. When pansies are planted during warmer weather, they may appear yellow and become more susceptible to damage from pests and disease. Planting pansies during cooler weather, on the other hand, may stunt their growth and flowering. This is because the roots of pansies absorb fewer nutrients when temperatures drop below 45 degrees Fahrenheit.