Pest control expert Adam Juson has shared a simple method to help homeowners keep large spiders out of their homes this October. Spraying a common ingredient near windowsills could make a significant difference.
Large spiders are especially prevalent in October as it marks the height of spider mating season, meaning encounters around properties are far more likely during this period. By autumn, spiders have completed their growth cycle and reached full adult size, which explains why they appear particularly sizeable at this time of year.
Why more spiders appear in autumn
With more frequent rain and dropping temperatures, spider season is now in full flow. Spiders are not just seeking somewhere warm, sheltered and undisturbed — males are actively hunting for potential mates. This explains why significantly more unwelcome eight-legged guests are likely to be encountered over the coming weeks.
Adam Juson, co-founder and director of commercial pest control specialists Merlin Environmental, explained that harsh chemicals or costly treatments are not necessary to keep spiders away — a few simple adjustments will suffice.
Sealing gaps and using peppermint oil
First and foremost, it is advisable to seal up any gaps. Spiders can slip through remarkably small openings, so begin by inspecting potential entry points. Juson said: "Take a look for gaps and cracks around window frames, underneath doors and anywhere pipes or cables enter your home. Sealing them will have more impact than anything else."
Peppermint oil is another option for making a home less appealing to spiders. "Regularly spraying diluted peppermint oil around windowsills, doorframes and skirting boards actually works," Juson added. "And it's non-toxic, so it's better for you and your home."
Peppermint oil works as a natural spider repellent because its potent menthol and monoterpene compounds overwhelm spiders' highly sensitive sensory and smell organs found on their legs.
How to apply the repellent
Ensure the oil is diluted prior to use and applied regularly to keep it effective. Mix one cup of water with 15 to 20 drops of pure peppermint essential oil. A splash of liquid dish soap can also be added if desired.
Decant the mixture into a spray bottle and spritz windowsills, door frames, skirting boards, dark corners and any cracks where pests could get in. Alternatively, place a few drops of pure oil onto cotton wool balls and tuck them into tight spaces or corners. If you have pets, exercise some caution — it is best avoided around cats and dogs.
Other ways to deter spiders
Juson explained: "Spiders also come indoors looking for food. So, if you have flies, moths and other small insects around, spiders will follow them in."
Insects can be challenging to deter, but maintaining tidy bins, installing window screens and eliminating stagnant water are effective methods to make a property less appealing to them. Relocating garden lighting away from doors and windows can also prove beneficial.
Frequent hoovering can make a difference too. Juson said: "Spiders search for mates by following silk trails. The more regularly you vacuum, the fewer trails they have to follow."
"Prevention always beats chemicals. So, do what you can to make your home less appealing to spiders, rather than finding ways to tackle them once they're in."
