A poisonous, non-native, profligate weed, Stinkwort, is moving at an explosive speed into Woodside from I-280, and now is the time to fight back before this year’s growth triggers deeper penetration into our Town next year.

Known scientifically as Dittrichia graveolens (L.) Greuter, Stinkwort, a native of Southern Europe and North Africa, is characterized by sticky, smelly foliage which can cause contact dermatitis similar to poison oak to humans and, in rare cases, illness or death to horses and other livestock. (Reference 1)


  1. Stinkwort is rapidly expanding its range in California, R. Brownsey, G. Kyser, and J. DiTomaso. California Agriculture, vol. 67, Number 2. April-June 2013.
  2. Weed Report on Stinkwort, excerpted from Weed Control in Natural Areas in the Western United States, J. DiTomaso, G. Kyser, et al., Published by Weed Research and Information Center, University of California-Davis, 2013
  3. Email Guy Kyser, Specialist, Weed Science Group, Department of Plant Sciences, UC-Davis to George Offen, member Woodside Environment: Open Space, Conservation and Sustainability Committee, August 17, 2017
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