I have about two hundred feet of fence line and about the same with my ditches at my home. What kind of weed killer can i purchase to kill weeds in ditch and fence line. I tried round up in the ditch but it didnt kill alot of the weeds same with fence line the roundup only killed the grass not some of the weeds. I dont feel like weedeating on my day off so any info on a weed killer would be great. also were i can purchase thanks.