It only blooms once a night.  Then the flower withers the following morning.  It is called the Peruvian Apple Cactus.  The GoPro Hero Silver was mounted in front of the cactus plan on one drizzling night.  It took around couple of hours to record the bloom.

 

This is actually edible.  My mother added the young florets in a dish called “dinengdeng”.  It is an Ilocano dish which consists of several local veggies with a fermented fish sauce.