
If you dig up their nest and keep disturbing it regularly, they will eventually go away. You can also dump used coffee grounds on the nest and mix them into the soil – they hate that. Plus the grounds are an excellent soil amendment and fertilizer. If you haven’t planted yet and don’t mind killing some soil microorganisms, dig up the nest and pour boiling water on it. Just pouring water on the ground without digging it up won’t help much; ant nests are designed to keep water, like rain water, out. The soil organisms will eventually return.
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Try Diatomaceous Earth – (simply put – it’s the ground up skeletons of tiny little sea critters.) Garden centers sell DE that is baited so that ants will eat it. It cuts up and dries out their insides. DE is not a poison, but you should still use some caution when applying so as not to inhale too much of the dust. Just follow the precautions on the bag.
Ants do not eat garden plants are usually are not an issue in the garden, despite what many newer gardeners assume (the chemical companies want you to think ants are always bad so they can sell you more poisons). if all you are seeing is ant hills don’t worry. if you start seeing ants farming aphids on your plants than daily spray a stream of water on the plants to knock the aphids off. After a week or so of this the ants usually give up and find a better place to farm.
Ants are essential for turning and mixing the soil and are, for the most part, very beneficial to our gardens