Combined with a sweet bait material like powdered sugar or honey, borax has long been an organic means of killing ant colonies, and it also works to kill roaches. Apply the mixture along the baseboards, in cracks, under cabinets, under sinks, and anywhere else that you've seen roaches in your house.

How long does it take borax to kill roaches?

How long does it take boric acid to kill roaches? Boric acid kills cockroaches within three days of coming into contact with it.

What do you mix with borax to kill roaches?

Borax and Sugar

It sure will, and it's one of the easiest recipes for borax pest control. It's as easy as mixing equal parts borax and sugar, pouring the mixture into a squeezable bottle and dusting the areas where you've seen roaches.