Red roses are a unique product — a commodity worth double the price for a very short, 24-hour period: Valentine’s Day.To cash in on this demand, flower growers have to figure out how to make millions of roses bloom exactly the right amount, at exactly the right moment, in the middle of February — get them from farms in Africa and South America to your doorstep.On today’s show: the logistical miracles and wild risks behind getting red roses to your Valentine.