Other types of dangerous lilies include lily of the valley. We don't know what makes the lily toxic, but we do know that all parts of the lily plant are harmful to cats. Ingestion of larger quantities can result in severe digestive upset; extreme difficulty breathing, rapid shallow gasps (dyspnea). Sources of poisoning: Many plants of the Lilium and Hemerocallis species are very poisoning. So when I up-potted the peace lily, I planted it a bit deeper to cover the long stems and give the developing roots potting medium to grow in. A cat will feel the effects of munching on a peace lily almost immediately. This is effective only if done within a couple of hours of the cat eating the lily. Easter lilies are extremely poisonous to cats, and just 1-2 leaves (or even the pollen) can kill a cat! Causes of Peace Lily Poisoning in Dogs All parts of the peace lily contain the calcium oxalate crystals that can cause distress to your pet. The white blooms of the peace lily generally appear in the spring as more of a modified leaf, a “bract,” than a multi-petaled flower. According to Pet Poison Hotline, the cells of peace lily plants, also known as Mauna Loa plants, contain calcium oxalate crystals. However, even the most aggressive supportive care is sometimes not effective, and sadly some cats die. The toxins include benzene, formaldehyde, trichloroethylene, xylene, and ammonia. If it is too late for this, your vet may put the cat on a drip to protect the kidneys. However, the calcium oxalate crystals that are ingested can do some damage. The standard peace lily can grow to 24-40 inches and deluxe plants can grow to 32-50 inches. Protecting Your Pets. If you think your cat has ingested some of the peace … The Peace Lily, also known as the White Sail Plant or Spathiphyllum, is one of the most popular plants to grow indoors. Gardening passions aside, I’m also a crazy cat lady in the making; a chick who’d be OK leaving her last day on Earth with a hundred cats in tow. In fact, eating as little as two or three leaves from the flowers can result in liver failure and, if left untreated, can have a fatal outcome for cats.