I have heard that also. I picked the first one that appeared and shortly after I picked that one, more flowers appeared, but this is the only one that seems to have set fruit out of all the flowers. So far. There are still more flowers in bloom at the moment. It also has more healthy looking leaves than before as well. I think the warmer days and nights have also helped. Last year, the eggplant suddenly began to set more fruit when the temperatures were hotter. I don't have much experience with eggplants, so I am just learning as I go and trying to note the differences of my previous attempts.
