9 common houseplants that can pose serious health risks

Many popular houseplants, while beautiful, contain toxins harmful to humans and pets. English ivy causes skin irritation, while ZZ plants, pothos, and philodendrons can cause nausea, mouth irritation, and swelling if ingested. Oleander is extremely poisonous, and daffodil, hyacinth, and tulip bulbs lead to gastrointestinal distress. Lilies are particularly dangerous to cats, potentially causing kidney failure.