Thanks Squid, it's what I plan on doing with one of my girls, from each strain I get. 2 lower branches is all that is needed.
Realcarlos is correct though, so you have to do your research and read reviews. 30 ppm is the bare minimum for feminized seeds for photos, I plan on buying a 50ppm bottle that has been reviewed and guaranteed to be at that level and spraying twice daily. Once she begins to flower I will put it into effect until she makes some plump sacks lol.
If you make some homebrew, you can spray once daily with 150 ppm or higher. 30-50 3 times daily, 50 - 150 twice daily, 150 - 200's once. That is what I feel is a decent spray calculation after what I have read on the subject. Spray during the off cycle of your light, or allow the spray to dry for 30 min to an hour before putting back under light. Remember water and light on leaves do not mix.
After the sacks form, move her out of the grow room, then put the bag back over her, and GENTLY razor or clip them off closest to the stem into a ziplock, cure it for two days or so until it cracks open and then you should have a bag of pollen, apply with a paint brush to the other side of the lower branch ( remember to keep the bag on her) and allow to set for 1-2 hours then allow a fan to blow directly to remove all loose pollen and while doing so give the branch a gentle shaking motion, even then you still may not want to put her back amongst your ladies for a full 24 hours.
Once the bud site has closed and you see pod formation, allow a week or so for the branch to feed and produce some quality seeds, clip the branch, and the stem will continue to use all of its remaining energy to feed and nurture the seed at an accelerated rate, I am telling you this method produces some really good seeds, since the entire stem removed knows its going to die, it puts that seeds production in hypermode in order to produce the highest chance of repopulation. Remove the seeds and discard or hash the remaining material.
Actually I have changed my plan, I am using this:
http://www.amazon.com/Colloidal-Silver-Ultra-240-ppm/dp/B0036RM6E2/ref=sr_1_5?ie=UTF8&qid=1332789687&sr=8-5
This and a daily spray, put this in a spray bottle and you won't have to worry about another bottle for a few full moons.