I have tackled a veggie garden a couple times on a small scale and with varying success. However, since going vegan, I really want to do a wonderful garden this year. The biggest problem I used to have was massive underground ant colonies under our garden area. We figure there are a few different colonies ( it is common in our area). I have tried to get rid of them with no success. And now I want to go organic, so I won't use insecticide. Does anyone know how I can get rid of these colonies without harming the soil or the plants?