Gardening

Garden Myth: Poisonous Poinsettias

Ill.: clipart.library

It’s that time of year again. As our favorite Christmas plant, the poinsettia, starts to pop up in stores everywhere, the rumor mill goes into overdrive. “Be careful,” you’ll hear, “they’re very poisonous.” You’ll even see some apparently serious sources (magazines, newspapers, websites, etc.) repeating this information … but it ain’t necessarily so.

The whole story began with an urban legend that appeared in 1919. A California newspaper of the sensationalist variety (sort of an early 20th Century National Enquirer) published a story claiming a two-year-old Hawaiian child had died after eating a poinsettia leaf. Then other newspapers around the world picked it up. Although this information proved unfounded, the story continues to circulate, in various forms, to this day. That’s one hundred years of fake news! 

Not Toxic, but Not Edible Either

Poinsettia (Euphorbia pulcherrima). Vinayaraj, Wikimedia Commons

The poinsettia (Euphorbia pulcherrima) belongs to the genus Euphorbia, well known for its poisonous plants. However, the degree of toxicity varies greatly among the some 2,000 species: some are very toxic, others less toxic and some are even edible. Their white sap contains a wealth of chemical compounds among which terpene esters are probably the most toxic.

The poinsettia is among the least toxic species. In fact, poinsettia sap should be considered an “irritant” rather than poisonous. The milky sap (latex) dripping from cut stems and leaves may irritate the mucous membranes or the eye. And if you’re allergic to latex, you will be to poinsettia latex as well. For that reason, it is always wise to wash hands after pruning a poinsettia. Besides, you’ll want to wash your hands: the sap is sticky.

As for oral consumption, poinsettia leaves have a nasty taste which causes humans and animals to spit them out quickly. Swallowing a few leaves will have no detrimental effect, other than a possible reddening of the inside of the mouth. If ever someone eats a lot of leaves, however, he can suffer from vomiting or diarrhea … just as he would if he ate any other inedible product.

What Do the Stats Say?

It is interesting to take a look at the statistics about poinsettia toxicity. For example, the American Journal of Emergency Medicine reported in 1996 that of the 22,793 cases of poinsettia exposure between 1985 and 1992, not only were there were no fatalities, but 92.4% of subjects (most of whom were young children) had no symptoms at all. According to POISINDEX, a 50-pound (23 kg) child would have to eat between 500 and 600 bracts (coloured leaves) to become sick. Moreover, with the exception of the urban legend mentioned above, no fatalities connected to poinsettia consumption have ever been reported. 

Coffee is more poisonous than the poinsettia. Photo: theprincela.com

To make a comparison with other products commonly found in our homes, the poinsettia is less toxic than hand soap, table salt and coffee, all products that are not normally considered toxic but could theoretically kill you if you consume too much of them. Even spinach, rich in oxalic acid, is more toxic than poinsettia leaves … and we regularly feed spinach to babies!

But What About Pets?

Several years ago, the ASPCA, the most important reference in plants toxic to animals, still listed the poinsettia as highly toxic to cats, dogs and horses. Now it lists it is solely as an irritant. To quote, it is “irritating to the mouth and stomach, sometimes causing vomiting, but generally overrated in toxicity.”

In conclusion, therefore, no, the poinsettia is not toxic per se, but neither is it edible. Simply don’t leave it within reach of children or pets. And if ever a child or pet manages to eat a leaf anyway, they probably won’t enjoy the experience, but at least you won’t have to worry.

Adapted from an article originally published on November 28, 2015.

Larry Hodgson is one of Canada’s best-known garden communicators. He has notably been editor-in-chief of HousePlant Magazine, Fleurs, Plantes et Jardins, À Fleur de Pot and Houseplant Forum magazines and is currently the garden correspondent for Le Soleil and radio garden commentator for CKIA-FM Radio. He has written for many garden publications in both the United States and Canada, including Canadian Gardening, Harrowsmith, Horticulture, Fine Gardening and Organic Gardening. He also speaks frequently to horticultural groups throughout Canada and the U.S. His book credits include The Garden Lover’s Guide to Canada, Complete Guide to Houseplants, Making the Most of Shade, Perennials for Every Purpose, Annuals for Every Purpose, and Houseplants for Dummies, as well as nearly 60 other titles in English and French. He is a past president of the Garden Writers Association (now Garden Communicators International) and the winner of the prestigious 2006 Garden Media Promoter Award offered by the Perennial Plant Association. He resides in Quebec City, Quebec, Canada.

7 comments on “Garden Myth: Poisonous Poinsettias

  1. very interesting 🙂

  2. I think we need a billboard in each town to reinforce this because I hear it every year as I’m sure most gardeners and poinsettia lovers do. 🙂

  3. A few slightly toxic or even non-toxic plants get this sort of hype, while seriously toxic plants do not. Not many of us are aware of how toxic Digitalis is, but are more concerned with seeds of wild plums (which take serious effort to shell before eating!) There had been concern that the oleander (which is now gone) in the median of Highway 17 through town wax toxic. Perhaps it is to someone who might feel compelled to make a big salad of it, after dodging two lanes of speeding freeway traffic to get to it. I suppose that is why we need labels on fast-foot coffee warning that ‘Hot coffee might be HOT’.

    • I’m always amazed at how concerned some gardeners are about poisonous plants, not wanting any in their yards or gardens, yet there are almost no poisonings due to plants. And these same people have homes filled with products that do kill people and pets: cleaning products, medicines, pesticides, alcohol, beauty products, etc.

      • We had a client who went beyond that paranoia, and wanted only plants that were used medicinally for poising from other plants; as if their kids who were stupid enough to eat a pound of oleander (which was nowhere around) would be intelligent enough to eat the juvenile leaves of ostrich fern to neutralize the toxin. That client should not have had kids, or just locked them in the basement forever.

  4. Pingback: Poisonous Plants: Guilty Until Proven Innocent – Laidback Gardener

  5. Thank you for the detailed information. I really needed help with my poinsettia.

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