Brian, I have grown the blue form of Mandragora off. for many years in a cold frame here but have never seen a seed pod; the green one sets seed sporadically on a raised bed in the open There is only one plant in both cases so one form at least is self fertile. By the way if you want to try the more desirable blue form let me know. Peter.Maynard@btinternet.com S.E. England Zone 8 Coastal Plain natales grate numeras.