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A dozen of the deadliest garden plants rhododendron

Rhododendron (Rhododendron ponticum)

Why we grow it: Give them moisture and shade, and rhododendron shrubs offer showy red, white, pink, or purple flower clusters in spring and thick, glossy leaves that thrive into the winter.

Deadly parts: The entire plant.

Toxic toll: Who knew both West Virginia and Washington's state flower was a silent killer? Swallow any part of this plant, and you're going to look as bad as you feel. While drooling from the mouth and teary-eyed, you'll begin vomiting violently, just as your pulse slows down and low blood pressure sets in. Death can occur shortly after falling into a coma or during a violent seizure.

Photo by Flickr user Ryan Somma

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