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A dozen of the deadliest garden plants

Why we grow it: Part of the buttercup family of flowers, larkspur adds a high-impact, low-maintenance dose of color to your garden with its clustered blooms and colorful petals, typically ranging from white to blueish purple. 

Deadly parts: The entire plant, though the young leaves and the mature seeds contain the highest concentration of toxic alkaloids.

Toxic toll: These enticing blue growers are definitely just for looking—not eating. Immediately after ingestion, nausea, burning in the mouth, vomiting, and slowing of the heartbeat set in. Seek treatment right away, because six hours is all it takes for this flower to become lethal.

Photo by Flickr user Alwyn Ladell

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