A few years ago I caved on my position of having an all organic garden and used some Roundup on a grass that is rhizomatous and endemic to this area. The Agricultural extension could not identify it, but it is broadly known. Many go to raised beds as a last resort. Anyway, the Roundup appeared to kill the stand of the grass in a corner of my vegetable garden, but the next year it came back with a vengeance as if I had spoon fed it a tasty meal. Lepidium latifolium commonly known as Tall Whitetop or just Whitetop http://blm.gov/ca/st/… , http://unce.unr.edu/programs/sites/… is another plant that seems to ignore Roundup. The flowers are similar in appearance to Baby's Breath so vendors often come to this area to collect the flowers for free and then sell them as Baby's Breath thus spreading the seeds. It is starting to invade our property and I am at a loss as to how to deal with it. In the past we have kept it mowed hoping to stunt its growth. This year I'm considering using a weed burner on it. The Rancher across the road keeps it controlled by grazing, but it grows in the right-of-way along the road and the seeds blow onto our property. Grazing controls it in our fields, but I do prefer to have flowers, lawn and vegetables on some of the land! Point- if Roundup left no residue, there would not be the requirement (law) to wait 5 years after the last application to be considered organic Colleen NE Calif -----Original Message----- From: email@example.com [mailto:firstname.lastname@example.org] On Behalf Of Alberto Castillo Sent: Wednesday, April 03, 2013 5:31 PM To: Pacific Bulb Society Subject: Re: [pbs] Cardamine hirsuta Jadeboy, this is what we have been discussing in this thread. I assume everybody would know but clearly not. Genetically engineered soybean and other crops are being widely sown in South America, Africa, and elsewhere. This soybean, etc., has been genetically modified to become resistant to Roundup; this will kill most of the existing weeds AND native vegetation of all sorts but not the soybean. This way competition from other vegetation is eliminated. Christian, it seems Roundup has a sort of hormonal effect on Cardamine hirsuta boosting is germination to abnormally succesful rates. Otherwise there is no evidence that an effect on Cardamine was among the goals when projecting the product. As a matter of fact, germination improvement of no plant was ever mentioned among the product's "benefits". However there is not the slightest doubt that this actually happens from postings in this same thread.