Wild Parsnip

Wild Parsnip: Too Late to Control, Not Too Late To Identify

Wild Parsnip (Pastinaca sativa L., family Apiaceae (previously Umbelliferae)) is in full bloom in Ohio with recent hot temperatures accelerating seed development, particularly in the southern part of the state. This means it’s too late to reduce the seed bank of this highly dangerous non-native invasive weed by targeting flowering plants with herbicides.
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Joe Boggs

Poison Hemlock and Wild Parsnip are Bolting and Blooming

Poison hemlock (Conium maculatum) is one of the deadliest plants in North America. Wild parsnip (Pastinaca sativa) sap can produce severe, painful skin blistering. Both are commonly found growing together in Ohio and both are beginning to bloom meaning the clock is quickly winding down for controlling these non-native nasties.
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Joe Boggs
Poison Hemlock and Wild Parsnip are Blooming in Southern Ohio boggs.47@osu.edu Wed, 06/03/2020 - 16:31
Poison hemlock (Conium maculatum) and wild parsnip (Pastinaca sativa) are two of our nastiest non-native weeds found in Ohio. Poison hemlock is one of the deadliest plants in North America. Wild parsnip can produce severe, painful blistering. Both are commonly found growing together.
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Joe Boggs
Be on the Lookout for Wild Parsnip! boggs.47@osu.edu Thu, 04/09/2020 - 14:44
Wild parsnip (Pastinaca sativa L., family Apiaceae (= Umbelliferae)) plants are now large enough to be readily identified in southwest Ohio. This Eurasian native grows as a biennial in Ohio requiring two seasons to complete its life cycle.
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Joe Boggs
Poison Hemlock and Wild Parsnip are going to Seed in Southern Ohio boggs.47@osu.edu Fri, 06/21/2019 - 09:09
Poison hemlock and wild parsnip are two of our nastiest non-native weeds found in Ohio. Poison hemlock can kill you while wild parsnip may make you wish you were dead. Both are commonly found growing together and continuously wet conditions caused both to flourish this growing season. The size of some infestations has been remarkable. Poison hemlock produces white flowers on stalks that create a more rounded look; perhaps a bit more like an umbrella.  Wild parsnip has intense yellow flowers with the stalks producing a more flat-topped appearance.
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Joe Boggs
Erik Draper
Be Alert to Wild Parsnip! boggs.47@osu.edu Wed, 05/15/2019 - 13:57
Second-year wild parsnip plants are producing deeply grooved flower stalks topped by characteristic bright yellow blooms in southern Ohio. Landscape managers and gardeners should exercise extreme caution around this non-native invasive biennial plant.
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Joe Boggs

Towering Poison Hemlock

Poison hemlock (Conium maculatum) is among the most deadly plants in North America.  This non-native invasive weed contains highly toxic piperidine alkaloid compounds, including coniine and gamma-coniceine, which cause respiratory failure and death when ingested by mammals.  The roots are more toxic than the leaves and stems; however, all parts of the plant including the seeds should be considered dangerous.  It is a common misconception that poison hemlock sap will cause skin rashes and blisters.  In fact, poison hemlock toxins must be ingested or enter through the eyes, cuts, or...

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Authors
Joe Boggs