“Poinsettia plants are deadly poisonous to humans and pets if ingested.”

The idea that poinsettia plants are deadly poisonous to humans and pets is a widely circulated misconception, especially during the holiday season. This persistent myth largely stems from an unconfirmed report dating back to 1919, involving a two-year-old child in Hawaii who reportedly died after ingesting a poinsettia leaf. This isolated and unsubstantiated account was later cited in the 1944 book "Poisonous Plants of Hawaii," which erroneously stated that the plant's milky sap and leaves were poisonous and could cause severe symptoms, including delirium and death. Although the author later retracted the claim that the poinsettia caused the child's death, the terrifying story had already taken root, spreading widely as an urban legend.

Despite the widespread belief, scientific and medical evidence consistently debunks the poinsettia's reputation as a deadly plant. Extensive studies, including research conducted by Ohio State University in the 1970s, demonstrated that even when animals were fed unusually large quantities of poinsettia plant material—equivalent to a 50-pound child consuming 500 to 600 leaves—no signs of toxicity or fatalities occurred. Furthermore, a comprehensive review of over 22,000 poinsettia exposures reported to U.S. poison control centers found no recorded fatalities. The vast majority of individuals experienced no symptoms at all, and in cases where symptoms did occur, they were typically limited to mild gastrointestinal upset, such as nausea or vomiting. The U.S. Consumer Product Safety Commission even concluded in 1975 that poinsettias are non-toxic (Review).

The myth's enduring nature can be attributed to several factors. The initial, albeit incorrect, report being published in a textbook lent it an air of scientific authority, making it difficult to dislodge from public consciousness. Additionally, poinsettias are often mistakenly grouped with other genuinely toxic holiday plants like holly and mistletoe, leading to "guilt by association." The plant's name itself, "poinsettia," sometimes sounds similar to "poison" to some, further reinforcing the idea of danger. While it is always wise to keep any houseplants out of reach of curious children and pets to prevent mild stomach upset, the beautiful poinsettia is far from the deadly threat it is often portrayed to be.