Dear Robert, I observed blooming synchronization with other types of night blooming cactuses (Echinopsis - their flower dies in the morning), but I did not find the flush to be correlated with the lunar cycle. It was logical to me that plants having such a ephemerous bloom find a way to synchronize, or they may never crossbreed. I had almost 60 of them, and because they were in pots, I made the experience to have half of them in front of the house and the other half at the back of the house in the garden, hypothesizing that if synchronization was of chemical nature, the two groups will not be synchronized together, although individuals within each group would bloom synchronized. Instead, the two groups were recurrently synchronized. For C. sativus, it is more mysterious. I have other fall blooming crocuses and they also prefer blooming around new or full moons. Because these flowers will not be pollinized at night, and because the new moon does not make them more visible at night, the nature of synchronization remains mysterious. I would really like to get to know more about this phenomenon - chemical communication between plants being already documented. Christian