I could type out a couple paragraphs but a member did it in one.. so I'll just borrow from him
Keep one male alive, but keep him small by keeping him in a small pot. Keep him well away from the girls - my girls grow on my roof terrace, I keep any male in a corner of my garden downstairs. Carry out this procedure about 4 weeks into flowering, when there are a good load of trichomes, but about 4 weeks before you expect to harvest, as it takes seeds that time to fully mature. Mature seeds are brown, immature seeds are white.
Take a plastic freezer bag, put it over the male and give it a shake. You will collect a good lot of pollen in the bag - you may not actually see anything, but it´s there all right. Now put the bag around one flowering branch of one female, secure it with an elastic band, give it a good shake, leave it for a week.
I'm not too big on leaving a plastic bag over a branch for a week .. so 3-4 days is sufficient in my experience .
also it should be noted that by only seeding one or two branches, You'll not ruin your sensimilla crop
Seeds are best kept : airtight, between the temps of 34 and 40 degrees Fahrenheit ( your fridge works exceedingly well), with some sort of wicking agent. Desiccant packages ( those little "salt packs" you find in shoes and pill bottles to keep em dry ) or rice kernels work well IME.
I have seen lots of growers say to keep seeds in the freezer. The same rules apply as keeping em in the fridge. Get em airtight and add something that can wick away moisture should it accumulate. ( personally, I've had bad luck with freezers and seeds, so I stick to the fridge)
now feel free to ask any questions .. but please remember this is not a breeding thread per say, it is the thread for growers who simply want to keep their genetics alive, so question accordingly please.
PS ..Yes, I'll/We'll answer the basic breeding questions, but let's keep this thread simple. TYIA