Borax is just as poisonous as insecticide and there is a very VERY fine line as to how much you can use in the garden before you have irrevocably poisoned the ground. Borax, made out of Boron, a mineral that does not break down and dissipate with time and a salt of Boric Acid. Boron is a naturally occurring trace mineral. Using Borax is cumulative since it doesn't break down.
