Take a tablespoon full of powdered cinnamon and dump it on the soil, where the ants are building. The strong flavor of the cinnamon should be enough to scare of any ants that were thinking about colonizing your plants.
If you find that this isn't enough to deter your new insect pals, dissolve a few more spoonfuls of cinnamon in some distilled water (the same amount you would use to water your plants) and pour it over your topsoil. Allow your cinnamon-water mixture to soak in. This strong-smelling concoction will absorb into the soil, tainting it's flavor. This method is a sure fire way to send ants packing.
Happy growing! 👊