Pansies bring strong cool-season color in containers that can last well into the New Year in regions with mild winters. Choose pot planting partners that also deliver a long show, like Blue Arrows juncus, a type of rush, and sweet alyssum. For longest lasting color, keep pots in a sheltered spot on a porch. When air temps fall below 25 F, pansies look wilted and leaves turn gray-green. This is a typical response to cold air. Plants rebound as air temperature rises.