We have dandelions growing everywhere and they won't touch them. Gotta get some mint; that stuff spreads everywhere here.
I had the end of a bag of scratch get some mold in it, so I planted it -- just ran the tiller lightly over, broadcast it, raked it a little, and stuck some chicken wire around it. The millet came up in force. I let them into the patch when it was about 6" high. Took them maybe 3 days to wipe it out.
Note to self: let it go to seed next time.