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Some plants that are toxic to animals or insects are also toxic to people. Daffodils, for example, are considered poisonous to humans (although they are rarely fatal). Most of the other plants listed above, however, are safe (and delicious!) for humans to eat, including basil, rosemary, and lemongrass.

Since fleas reproduce so quickly, the mere presence of one flea could mean you have an infestation on your hands. Hundreds and even thousands of fleas can lurk in your pet’s fur, carpet, furniture, and even your body. If you see fleas jumping on household items or notice your pet scratching more than usual, those are signs of infestation.

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.

Hawks might seem like fearless predators, but these smart birds do know what other animals to be cautious around. Hawks are naturally wary of humans and predators that see them or their eggs as a potential meal or threat. This list includes owls, crows, eagles, and even snakes or raccoons.