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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.

There are several possible reasons for a gnat infestation, and they vary based on the type of insect. One common reason is overwatering houseplants, which can create a moist environment that is attractive to fungus gnats. Another reason is leaving fruit out on the counter for too long, which can attract fruit flies. Drain flies are typically attracted by standing water and bacteria that are often the result of buildup or a clog in your drain or sewer line.

Citrus scents such as lemon or lime are lethal to bed bugs. They’re drawn to the smell, but the chemicals often kill them. There are other ways to kill bed bugs without an exterminator, including using steam, DIY heat treatments, essential oils, diatomaceous earth, and more. However, you should hire a professional bed bug exterminator to eliminate large numbers of bed bugs.

When you’re checking for bed bugs in your home, start by searching for the telltale signs rather than the insects themselves, as they tend to stay hidden during the day. Here are the key signs of a bed bug infestation:

• Rust-colored or reddish stains on mattresses and bed sheets

• Dark spots on fabric

• Shed skins

• Fecal matter (looks like black spots)

As for fleas, you can typically spot them on your pet. If you notice them scratching themselves excessively, look for bites and bugs on their skin and fur.