A pyrethrin or pyrethroid product will kill the ants in the pot without killing worms or other beneficials in the soil. The granular product Triazicide that comes in a tall can with a shaker top is great for controlling ants in a pot without side-effects on you or anything else in your yard.
If you want something completely natural, then get powdered Borax -- typically sold in squeeze bottle as powered Boric Acid.
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Originally Posted by Worm_Farmer
Forget the green stuff, I go right for the good stuff. I have been using Talstar to treat the entire yard.
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The active ingredient in Talstar is Bifenthrin - a well-behaved Pyrethroid which is made by technical distillation of African Chrysanthemum oil. It is a "green" product and can be sprayed every night on produce in a supermarket (by someone with a license) if desired or necessary.
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Originally Posted by The Hollyberry Lady
Whole cloves puts the run to ants as well, and it's environment-safe to use. 
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Although we do use cloves as an herb in cooking, the essential oils are toxic to a number of living things and contraindicated for many people as well. I don't believe its use as a pesticide is environmentally friendly.