How can I kill the ants that have made their home in my planters,

I would spray them with Victor's or EcoSense natural ant killer. I get at True Value.

Repot your plants in new non contaminated potting soil. Be sure to sanitize the pot too. Take care and wash the roots carefully before placing in in clean soil in clean pots. Dispose of contaminated soil.

terro ant baits I found are the best way to get rid of small ants. I'm having issues with the big red ones.

My daughter used white sugar, which stopped them in their tracks.

Was reading today that ants hate cucumbers and keeps them away. Hopefully you don't have the one inch ants that really bite and sting..

If you have ants in your planters there most likely is aphids. re-pot in fresh soil and clean containers,then make sure the plants are sprayed in horticultal oil

packaged cornbread mix that says it is sweetened and put it where they are coming in if you can find it. They will take it to the mound, everyone will eat it and die, they can't digest the cornmeal, but will take it because it is sweetened. Little goes a long way.