stress is a major factor in the game of hermies
try to avoid stress as much as possible
don't worry, it happens to the best too, as you see
in the future, when plants go into flowering, keep checking the stems for male and female symptoms, easy done and easily cut away when you see them on time.
on the other hand, you will have a couple of hundreds of high quality female seeds.
also, the taste on "pregnant" weed is very nice, you won't find that taste again, it will be less potent than normal though
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