My approach to gardening is benign neglect. The outcome of such loving disregard is that sometimes things behave in an unexpected and undocumented manner. Leeks, apparently, are not supposed to self-propagate.
I bought perennial leeks from Southern Exposure Seed Exchange in November 2012. Those original leeks self-propagated and I replanted those pups. This past fall, I planted the now THIRD generation of those original bulbs. Yesterday, I harvested the remainder of the leeks and pulled away many of the pups.
I replanted some for myself. I had such an abundance, I shared with two people in the Grow Gainseville! Facebook group. The leek lives on. I spent a fair amount of yesterday harvesting, trimming, cleaning and cutting leeks in preparation for freezing.
I love my Seal-a-Meal contraption.
I also took the chopped off root structure and suspended them in mason jars to see if I could regrow leeks from those roots in the way we all regrew carrots from cut off carrot greens.