Best Natural weed control? (grass, mower, yard, weeds)

[mdovell]

My yard isn't exactly flat. I use a reel mower for a bit and it's great on grass but pretty bad on weeds that evade it. It's getting bigger now and it's more than a foot tall. My neighbors have kids and pets and sometimes I get neighbors chickens so I don't want roundup. What's the best natural weed treatment? It's also to the point where I might want to get the old fashioned puller...

[NYC refugee]

Spot weeds you can kill with boiling water but overall kinds of weeds need work to keep down without chemicals.
A weed whacker (you can get one with a battery) will get the thicker-stemmed stuff the reel mower doesn't and anything bigger you can pull or dig up.