A hardy perennial bean has been a wish amongst permaculturists for some years, and one of the most interesting species is Phaseolus polystachios. Jonathan Bates of Paradise Lot fame (with Eric Toensmeier) kindly sent me seed last year. The 2-3 plants sadly all died. This year one of my remaining seed germinated and the resultant plant has grown well, kept indoors all summer.. It is now in full flower in the living room, but has been invaded by aphids. Is it self-fertile?
See my earlier blog post here http://www.edimentals.com/blog/?page_id=3600