How poisonous are elephant ear plants?

They're edible foods: These are actually edible plants--leaves, stems, and roots, but must be cooked. The roots are somewhat similar to potato and is known as taro. The leaves and stems are often used for soup etc...They are quite rich in iron. Different ethnic groups use these differently, but these are delicious edible plants and are important source of foods in some region of the world. Explore! enjoy! good luck.

Poisonous: Elephant eat plants contain high concentrations of oxalic acid. Eating the leaves and stems causes irritation and severe burning in the mouth, lips and gastrointestinal tract. The mouth, tongue, throat and esophagus will begin to swell, which can cut off the victim's airway. Vomiting, nausea and diarrhea can occur too. Emergency care is needed if pets or people eat this plant.