Can anyone offer suggestions as to what can be done with thin grass spots. I applied a crab/weed killer last fall and the grass now is sparse and thin. I have had no luck in topseeding and do not wish to rake in topsoil. The area has good sun exposure and can be watered when required, but the soil is fair to poor. Any suggestions in increase denseness is appreciated. I'm concerned that the weeds will again take control if the grass doesn't get a quick head start. Thanks.