I've found NICE plants at the showdog kennel where me & a co-worker would sit in her van to smoke & throw our seeds out the window. The worse thing that ever happened to them was getting ran over by one of the vans or the mower. The one on the corner did get a little burned from getting peed on too much! Other than that, they were perfectly happy growing amongst the ragweed! We 'grew' a nice little crop there for 6 years, with no help from us except to harvest.