Whats a inherent ant contract killer? I have two huge ant hill in my courtyard and I want...

I have two huge ant hill in my courtyard and I want them gone. I'm pregnant, so I can't use any chemicals. Is there anything I can put on them that would variety them go away? Perferably something that isn't going to slay the grass.
Somthing is consumption the leaves of my petunias?
Answers:    boiling water poured within anthills, or blackpepper spread over it. good luck
Gardening club?
you can use chemicals, especially since you will be outside(as long as you are contained by a well ventalated nouns most cleaning products are ok as well). just spawn sure you wash your hand or where gloves.