Like poison ivy and poison oak, there are a few other plants like the non-native poison hemlock and wild parsnip to be aware of that can cause irritation or serious illness. The City advises community members to carefully review the following descriptions of poison hemlock and wild parsnips and ways to control and eliminate the plants to help keep you and your loved ones safe.

Poison Hemlock

Native to Europe and North Africa, poison hemlock can now be found in all of Ohio. Fully grown, it stands at about 6-10 feet tall. However, they  look very different throughout the growth stages of the plant. The stem has a purple-speckled appearance.

As the name implies, poison hemlock is poisonous if ingested and can cause a painful rash if handled and if inhaled, can cause injury. Children should never handle poison hemlock. It is also poisonous to cats, dogs, and other animals. 

Control and Elimination 

It is possible to get rid of poison hemlock. Wear gloves, a long sleeved shirt or jacket, and pants. For early growth, dig the whole root out and throw it in the trash (not yard waste). Avoid mowing or weed-eating it as you could breathe it in. Herbicides can be used on the seedlings and when the plant is small, but avoid spraying on the adult plant. Follow the instructions on the container and never spray herbicides near waterways. It may take several years and several applications to eliminate it from an area. 

There are some plants that look like poison hemlock depending on the life stage. These include Queen Anne’s Lace (harmless) and giant hogweed (can cause burns and scarring).

Wild Parsnip

Native to Europe, wild parsnip can be found throughout Ohio. The plant is approximately 4-6 feet at full height. The sap causes rashes, blisters and discoloration of skin, so people should not handle the plant with bare hands. Children should never handle wild parsnip. 

Control and Elimination

Mowing wild parsnip can be effective if done before the plant goes to seed. However, make sure to wear gloves, long sleeve shirt, and pants and do not walk barefoot in the area of the wild parsnip. Herbicides can be used; follow the instructions on the container and never spray herbicides near waterways. It is not recommended to pull wild parsnip by hand because of the toxic sap.