Grow a male plant and allow the pollen sacs to mature have a sheet of glass under the plant and or shake the plan so that the pollen collects on the glass...scrape it up and wrap in a paper bag...you should have a few grams of white powder...It can keep for years in a freezer.....store in a cool dark place.....simply dust it onto a females buds relatively early into flowering with a soft paint brush and seeds with be produced anon