boric acid works nicely. I won't debate the organic-ness of it, but it is a naturally occurring salt.
regardless, I mix a little with sugar and water, to make a honey-like paste, which dribble in their pathway. It can take as long as a week, but seems to knock them back very effectively.
if I see a mound outside, I'll pour a Tbl of boric acid powder directly into the hive.
they eat it/move it out of the way and eventually die from exposure to it- at which point the other ants efficiently recycle the dead ants, which introduces the boric acid to the rest of the colony.
Seems to work slowly, but effectively and isn't poisonous to humans/pets unless you get mega-dosages.
I've also read that used coffee grounds will deter ants. Packing them around the base of plants/trees naturally fertilizes and also repels pests. Double bonus!
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