There are a few things that can cause a cannabis plant to become a hermaphrodite. Sometimes it's genetics, but it can also happen because of environmental stress. Things like extreme temperatures, too much light, or even pests can cause a plant to get confused about its sex and start producing both male and female flowers.
Yes, breaking the stem can definitely cause some serious stress on a cannabis plant. When that happens, it can sometimes trigger the plant to start producing both male and female flowers, making it a hermaphrodite.
It's really 50/50 when you give stress just depends on gentics and randomness fr fr.
You might hrow the same strain and do the same thing a different grow but then it