These are beauties for the spring, if you are in a northern climate. I have been growing them outside for 4 years now. Earliest outdoor bud available. Save your largest male, instead of pulling, grow it outside of the box until the pollen falls. If you have space find a home out of the box for about 3 weeks. If there is no breeze, you can use a paper plate to catch the pollen as it falls. Cut the paper plate, one radius cut, a straight line from the center to the outer edge. Now at the base of the plant, open the cut on the plate, and place the stem in the center of the plate. Let the plate return to its pressed form with the stem in the center. As the pollen falls it will land on the plate.
The idea behide catching the pollen is to save it and using a artist paint brush. dip into the pollen and brush one or two flowers and not the whole plant. You will have weed with seeds where you painted, and sensi for the rest of the plant. Or you could let the male stay in there knock up all the ladies and you will have seed for a year. Either way you need seeds.