Well there is no way anyone would ever plant potatoes here on Christmas and have them grow.My daddyinlaw used to say the best time to plant taters is when the ground is ready. My dad once planted taters right at Christmas, and had a bumper crop. Last few years, I have sort of been following the signs and moon phases and that seems to work too. Just for info for those that dont know, Easter and Good Friday are based on moon phases and planet alingment and is why Easter falls on different days and even different months each year. https://www.timeanddate.com/calendar/determining-easter-date.html