Wild Parsnip

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.
Published on
Authors
Joe Boggs

Poison Hemlock and Wild Parsnip are going to Seed in Southern Ohio

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.
Published on
Authors
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.
Published on
Authors
Joe Boggs
Towering Poison Hemlock boggs.47@osu.edu Mon, 06/06/2016 - 20:56

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...

Published on
Authors
Joe Boggs

Wild Parsnip is Blooming in Southern Ohio

Wild parsnip (Pastinaca sativa) plants are rising towards their full height and blooms are beginning to appear in southern Ohio.  Landscape managers and gardeners should exercise extreme caution around this non-native invasive plant; the plant's juices can cause phytophotodermatitis (a.k.a. Berloque dermatitis).   If plant juices contact skin and the skin is then exposed to sunlight (specifically ultraviolet light), severe blistering can occur, as well as skin discoloration that may last several months. 

...

Published on
Authors
Joe Boggs