This has its own category above, but because it's such a popular topic, I want to touch on it here in the FAQs. Years ago, they were billed as being highly toxic and poisonous. Now, most experts say they’re mildly toxic. Even the ASPCA says Poinsettia plants are commonly overrated in terms of toxicity. The leaves and stems emit a sap that could make them sick. I’ve had kitties my whole life and none of them have paid any attention to my poinsettias. If your pets chew on plants, then keep the plants out of their reach.