There are several threads on Pollen collecting and Pollenating on the forum. Do a search and read up on the various methods.
I will sometimes pollenate a single branch of all the females in a grow if I am interested in growing them again. Here is how I do it. Of course your timing may vary due to conditions and strain. At about 2 1/2 weeks after sprouting, the males will start to show. The best one gets moved to a little box in a spare room to live out his life on meager rations.
At about 3 weeks the females will show and they get transplanted from the 32 oz cups into 2 gallon pots.
At about 4 weeks the male starts dropping pollen. I pollenate the female at about 5 weeks. By then she has developed lots of buds, but still has enough life left to produce mature seeds. A couple of days before Pollenating, I give the male a good shaking over some newspaper so that I have fresh pollen later on. The day of Pollenating, I give the male another good shaking, this time over wax paper. With a spoon, I remove all the flower parts and anything else that isn't pollen. Then I fold the wax paper in half, then in half again so that the pollen collects in the middle. Then I turn off anything with a fan or blower and close the windows so that the air is still.
Then using a little artists paint brush, I dip it in the pollen and paint a little dust on the buds that I want to seed. A little goes a long way. If you use a black bristled brush, you can see the pollen better. I do the Pollenating on the dining room table where the light is good, then leave her there for a few hours to let the dust settle. You will have some nice seeds after 4 to 5 weeks. Give each one a nice hard pinch, the immature ones will pop and crush easily.
I get anywhere from 30 to 80 seeds per branch.
