If you guys are going to give advice, make sure you know that it's correct. He said he only used Roundup, and glyphosate has no residual effect even the same day, certainly not years. If you’re one of those “I won’t use herbicide” folks, fine. But that is no help what so ever here. Sorry HunterOpel, I can’t offer much help. Seems baffling to me, but I can assure you it’s not residual effect from glyphosate as some are trying to get to believe.