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The most effective natural roach repellent is Borax with its key ingredient of boric acid and diatomaceous earth. But some homeowners may not feel like these are “natural” enough, especially since you can’t use Borax around curious pets or toddlers.

On the other hand, studies have shown that oregano oil mixtures have some of the best repellent effects, and other research indicates that catnip oil, peppermint oil, and citrus oils have notable effects on keeping roaches away. Rosemary oil has been shown to be the most effective natural oil for killing cockroaches outright.

Groundhogs are non-aggressive animals that are afraid of humans. They forage for vegetation in yards and gardens, so they can often be seen as a nuisance if you spot one on your property. That said, if you happen to get bitten or scratched by a fearful groundhog, be sure to get checked by a doctor, as they could carry infections or diseases like rabies, Lyme, or the rare tularemia.

There are plenty of scents spiders hate, but there are some scents scientists believe can work in the opposite way and attract them into your home. Some studies suggest that spiders may be attracted to stinky items like smelly socks. One thought is spiders are attracted to smells that attract more insects, such as mosquitos, which they feed on.

Tree sap is not usually dangerous to humans or pets. But some trees do produce dangerous sap. Notably, ash, birch, cedar and similar saps can irritate the skin but aren’t dangerous. Sap from trees like the Brazilwood, Mahogany, Milky Mangrove or well-named Poison Walnut can be corrosive, cause nausea, or trigger those with asthma. But for most backyard trees, protective equipment like a sturdy pair of gloves should be fine.