I am sorry for this delayed reply to your gardening question as we are transitioning to a new Q&A system. I hope this reply is not too late to be of help.
Ants can often be run out of container gardens by sprinkling cinnamon on the soil surface. You may need to water it in if they don't leave within a day or so. Thorough drenching of the soil can also make them leave. If you can set the containers in a bucket or tub and water until they are driven up and out of the plants that should work. If you do this, you won't need to leave the containers under water for more than a few minutes. Then totally drain the containers and allow them to dry out well for a day or two or whatever it takes to avoid drowning the roots by excluding oxygen. This can seriously harm your plants.
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