As long as it is dry, you can sprinkle diatomaceous earth on your plants and on the ground around the area. It is non toxic, not a chemical, and they can't develop resistance to it. To us it is like talcum powder, but to ants and slugs it is like broken glass.
Ants also don't like any of the mint family plants - spearmint or peppermint - or tansy. Mints can be invasive so it is best to actually plant them in a large deep container, such as bushes or other large plants may come in. Cut out the bottom or cut several large holes, and plant them in the garden pot and all, with the rim of the pot sticking an inch above the soil, to help prevent them from spreading by runners. If you do see any mint plants starting outside the pot, be sure to remove them right away (you could always put them in their own pots and plant them elsewhere, like next to the house where ever you suspect ants may be trying to get into your house).
Mint also supposedly repels raccoons, so good to put around your corn - again in pots and it could be left in the pots instead of buried in the soil, unless you want to have mint all over your beds.
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