We just bought a piece of property last summer and the previous owner did not control the weeds at all. We had kochia weeds the size of pine trees!! It was ridiculous. I do not like using conventional weed killers because of some health issues I have. I also do not like putting pesticides into the soil or environment. Does anyone know of any natural weed killers to kill the kochia, but not kill the grass that I am trying to grow? I would appreciate any suggestions. Thanks!