How to Apply Borax to Kill Fleas in Yards

Fleas jump onto animals and humans in a yard, and then end up in the house. By killing the fleas outside, it prevents fleas from infesting your home. Most commercial flea killers contain harmful chemicals. Borax comes from the earth and causes less environmental damage than chemical cleaners. Borax can cause poisoning to both humans and animals if eaten. Buy Borax with other cleaning products. Borax causes fleas to dehydrate, which kills them according to creaturecomfortsinc.com.

Things You'll Need

  • Borax
  • Organic diatomaceous earth
  • Salt
  • Measuring cups
  • Spoon
  • Bucket
  • Rake
  • Hose

Instructions

    • 1

      Locate the flea-infested areas. Concentrate on areas visited frequently by animals, like dog houses. The Daily Puppy states that treatment must be done when rain isn't expected for 72 hours.

    • 2

      Mix two parts borax, two parts organic diatomaceous earth and one part salt in a bucket, according to the Daily Puppy. The organic type is less harmful if eaten. Double or triple if needed. Cover the bucket with a lid if leftovers remain. Save for later use.

    • 3

      Remove any animal waste. The borax soaks in. Cover the yard with the borax mix. Rake it in the dirt. Keep the pets out of the yard as much as possible while the borax is down. The borax settles into the dirt after a couple hours.

    • 4

      After at least 3 days, wash the borax away with a hose. Borax and salt can kill grass. Waiting longer can cause more dead grass. Heavy rainfall works too. Remove standing water before allowing pets to go out into the area.