How does it know?

 How does it know just when to open? This Schlumbergera is a small genus of cacti found in the coastal mountains of Brazil.  This one spends most of the year on a bottom shelf in the greenhouse, neglected and ignored.  But each Christmas, as if by magic, its blooms unfold, creating magnificent color for our holiday table!

How does it know just when to open? This Schlumbergera is a small genus of cacti found in the coastal mountains of Brazil.  This one spends most of the year on a bottom shelf in the greenhouse, neglected and ignored.  But each Christmas, as if by magic, its blooms unfold, creating magnificent color for our holiday table!