Dangers in the Garden - Part 2Plants That Invade The Garden Plants Can Be Dangerous To Humans, Pets, or Livestock - by R. Lieber Some dangers in the garden come from invading wildflowers and weeds. In Australia they are afflicted with a plant, Dendrocnide moroides, whose touch is "... like being burnt with hot acid and electrocuted at the same time." In Tennessee we are more likely to encounter Giant Hogweed, a member of the extensive carrot family. Unlike members of the spurge family and poison ivy which mainly cause itchy irritated skin eruptions, members of the carrot family can cause photo dermatitis. Photo dermatitis occurs when skin is damaged by chemicals that are activated by sunlight.
Hogweed is listed in a publication from the University of Tennessee about identifying and getting rid of invasive weeds (see page 23): extension.tennessee.edu/publications/Documents/PB1785.pdf Both Cow Parsnip and common parsnip, a yellow flowered version that is not native, may cause photosensitivity when their leaves are touched or broken open. Gloves are sufficient protection for humans. Leaves of both are dangerous to pets when touched or eaten. However, the common parsnip root is edible just like its close cousin the carrot. Another related plant is Queen Anne's Lace, which can cause irritation of the skin.
Sometimes older common names will specify an affected animal. When "bane" was used in a common name it meant that it was considered to be poisonous or toxic to the named animal. Water Hemlock is sometimes called Cowbane, poison parsnip or poison parsley. It is one of the most poisonous native plants in the USA and can cause fatal nervous system damage. Hemlock, a relative to Cowbane, was introduced to this country for its pretty flowers. See the references below for pictures and information from UT Extension publications.
![]() No discussion of poisonous plants in East Tennessee would be complete without mentioning one of the most beautiful, the Datura. It has upright white trumpet flowers, broad leaves and prickly seed pods. While livestock are rarely poisoned in the field, due to the strong smell, they can be harmed if some is accidentally included in hay. It is poisonous to humans as well, but not always fatally so, and is used by Native Americans as a hallucinogenic. In Part 3 of this series we'll go over more painful and irritating plants. In Part 4 of this series we'll go over painful and poisonous critters. General Information - https://conservancy.umn.edu/bitstream/handle/11299/168768/mn_2000_eb_287-01.pdf Poison Hemlocks and Water Hemlocks
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