If you want nature to do its thing, take the male and the female you plan on breeding and seperate them from the other plants. Personally, i top the males just to control the stretch(just like females they will double to triple in size during flowering). Pollen sacks are going to pop up at every node and growing tip, and all you need is a little.

The Females take a couple of weeks to get prepared, but they will be ready for pollen about 2-3 weeks into flowering. The white hairs that pop out of each calyx, and it is their sole purpse to catch pollen and transport it into the middle of the seed bract. Its takes a few weeks of solid flowering before the hairs really start to pop up.

The male will also take a good 2-3 weeks to grow big clusters of pollen sacks. Once ready, the pollen sacks will split open and start shedding pollen. Like 86thcreator says in the above post, marijuana is a wind pollinated crop. Just placing the male next to the female will be more than enough. If your really worried, wait until the male really starts excreting pollen and shake it on the female. Youll know once pollination occurs, the white hairs turn brown/or orange and die off.

Seeds needs 4 weeks or longer after pollination to mature. Harvest the plant when the seeds are brown, spotted, and splitting out of each calyx. You will then have hundreds of seeds and have genetic stocks for years to come:thumbsup: You will also be able to grow out the seeds and find all the phenotypes that you never had with the original plant. The offspring will vary, and you might just find a hidden gem in those seeds.