What ways are there to kill ants outdoors that won't harm tortoises and won't seep into the ground making grasses, etc. inedible?
Where can I pick these up?Yes.
Use Terro ant baits. Its just sugar water and boric acid, so non toxic. They take it back to the queen and it wipes out the whole colony.
Where can I pick some up? Is there only one type or grade of DE?Diatomaceous earth. You can also use essential oils in water (peppermint is probably most common) as a deterrent.
Where can I pick some up? Is there only one type or grade of DE?