It happened in 1957 as an anomaly but since then...

Unfortunately, due to global warming, it's happening every year. You'd think a bumper crop every year is a good thing, and for the farmers themselves it is, however due to the extrememly precise nature and uniformity of the plant the data over the last 95 years of cultivation clearly shows that the rise in overal temperature is not only happening quickly but is accelerated by the actions of man.