You can force them to hermie by using a silver nitrate (?) Solution you spray on them-- HOWEVER it is poisonous and renders the buds un-usable...
it is THE only way to ensure hermying--
you then use THAT plant to pollinate a different female plant in order to get Feminized seeds...
if you let it "self' you double-up on all it's genetics- both good and bad...and a lot of the "bad" stuffis why way back when Feminized seeds were new to the scene people HATED them- they were unstable and turned hermie quite often late in the grow...
Many people try to 'stress hermie' their plants-- however- if you are able to stress them into hermying just with bad temps/light leaks etc... then allow it to self or pollinate another female... the seeds will be prone to stress hermying also...
I dont think he was talking about using colloidal silver. I thought maybe flowering the plant longer than normal since he said "at the end of flowering"
Most female plants I have seen that are flowered for an extra two weeks or so will self pollinate. This is a natural reaction of the plant and isnt indicative of bad genetics. Having a plant popping out bananas all over the place at 2 weeks into flower is different.
If that is the way they used to make fem seeds (silver), how do they do it now?