Saint Francis Xavier, Priest (Memorial)   From his roots a bud shall blossom.   Every year around this time, poinsettia growers are engaged in an elaborate regimen aimed at making their plants turn red at just the right time.   By following a precise sequence of exposure to light and darkness, they “force” the poinsettia’s green leaves to turn red.   The plant must be kept in sunlight during the day, then in total darkness at least twelve hours...