Conium maculatum, commonly known as poison hemlock, is not native to California. It was introduced to the United States from its Europe as a garden plant because of its popular and attractive white flowers (1). Poison Hemlock has often been confused for the wild carrot, which is a common edible garden vegetable. Don’t be fooled, every part of this plant is extremely poisonous when eaten. Because of their similar appearances. Not only is it poisonous to humans, this species has a large effect on the health of livestock such as cattle, sheep, goats, and pigs (2).
Native: Not Native to California
Flowering Period: April - September
Nature Serve Global Ranking: G5
Nature Serve State Ranking: SNA
(1) “Poison Hemlock (Conium maculatum),” U.S. Department of Agriculture, last modified June 26, 2018, https://www.ars.usda.gov/pacific-west-area/logan-ut/poisonous-plant-rese....
(2) “Poison Hemlock (Conium maculatum),” U.S. Department of Agriculture.
Map provided by the Jepson Herbarium, UC Berkeley. Jepson Flora Project (eds.) 2020, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/