As soon as you feel that winter is on the wane, go out and remove that winter packaging from your sensitive plants. Let them 'breathe'! Strangely enough, this is the time of year that most palms get damaged; try to avoid them experiencing too great a variation in temperature between day and night.
From mid to the end of March you can start administering slow-release Palmfertiliser. to your palms to develop their roots and provide lush crowns of leaves in the summer.