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A dozen of the deadliest garden plants

Poinsettia (Euphorbia pulcherrima)

Why we grow it: If you live in a warm, subtropical area like southern California, you might add the leggy poinsettia shrub to your yard. But most people bring the potted variety into their homes during the holiday season to deck out wreaths, dining room centerpieces, or fireplace mantles with its bright red leaves.

Deadly parts: The milky sap found in the veins of the plant.

Toxic toll: Despite its toxic reputation, poinsettias will never top the list of most poisonous plants, as there's only been two documented cases of them causing human death. But you'll want to teach kids not to touch or consume the plant, nonetheless. And as far as cats and dogs are concerned, keep poinsettia plants out of reach—unless you want to clean up after pet vomit and diarrhea. Take extra precautions if you have elderly, ill, or young pets.

Photo by Flickr user Mauricio Mercadante

A dozen of the deadliest garden plants

Your garden may be a relaxing retreat, but it's not a place to let your guard down, especially when it comes to small children and your family's pets. Some popular plants you prize for their ornamental beauty can turn into toxic killers within minutes if ingested, whether consumed out of curiosity or by mistake. With this list you'll know what flowers, shrubs and berries to warn young, inquisitive minds about and which bushes and flowers to keep out of paw's reach. You'll also learn the symptoms of poisoning because—after prevention—rapid treatment is the only defense against death. | By Danielle Blundell, This Old House Online

Also from This Old House:

 Plants to attract beautiful native birds
 Early-spring yard checklist
 Best plants for a healthy, organic garden