Umbrella Trees form crystals made of calcium oxalate, which can be fatal to household pets, including cats, dogs, and reptiles. Its sap is irritating to some people upon contact, and its leaves, flowers, and berries cause severe symptoms when eaten. These symptoms are not fatal but do include a burning sensation in the mouth, vomiting and drooling, swelling of the tongue, and airway obstruction. Place your Umbrella Plant where it can’t be accessed by children and pets.