I just picked up a new customer last night. She fired her old lco because he killed all the grass along a brick edged planter bed that wraps around the whole house. Apparantly he used roundup or something else and had alot of over spray. My question is how long does roundup contaminate the soil? What can I do to speed the process up or do i have to dig out the killed sections? She obviously wants green grass there and wants to know how long it would take. Thanks!