1. Flowers and plants
Poinsettias get the bad rap, but the plant you actually need to worry about is the fragrant lily (such as tiger, Asiatic, and Stargazer), which is commonly found in holiday arrangements and is highly toxic to cats.
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Just one chewed leaf can result in severe, acute kidney failure. Yuletide plants (like holly and mistletoe) can easily be mistaken for food, resulting in gastrointestinal upset and even heart arrhythmia. Silk and plastic arrangements are your safest bets; if you prefer real flowers, however, choose bouquets made of nonirritating choices such as roses, marigolds, orchids, or daisies.