When Do “Christmas Pointsettias” Flower South of the Equator?

People in North America like pointsettia flowers at Christmas time, in December.   But, there were, in full flower in Mozambique —in May.   May has rapidly shortening days of the year in Mozambique, (it gets dark about 5:30 PM)  south of the equator.  And, pointsettia plants have the internal chemistry that reacts to short days and controls the flowering of the plant.   A pretty neat and wondrous thing!