Does Borax Kill Spiders in the Yard?

Borax is not the best natural repellent for spiders, but it may kill their food sources.

Borax comes from sodium borate, naturally mined in California, Chile and other areas. Borax has natural insecticidal properties, making it a commonly used alternative to chemical insecticides. There is no evidence proving borax effectively kills spiders.

Borax

According to the Green Living Tips website, a mixture of borax and sugar or borax and honey attracts and kills ants, silverfish and other insects. Setting borax insect traps in the yard may free the yard of spiders by killing the arachnids' food source.

Warnings

Do not sprinkle borax directly on grass as it may be toxic to grazing animals. Use gloves and avoid inhalation when working with borax.

Natural Spider Repellents

Those looking for a natural spider repellent may find lemon juice, osage oranges and even tobacco leaves to be more effective, according to the Dollar Stretcher website. Consider placing crushed chestnuts around the yard in lieu of borax.

References

• Green Living Tips: Handy Borax Tips
• Dollar Stretcher: Natural Spider Control