Just the mention of the words “poison ivy” may have some of you itching already. The Johnson County Extension gardening hotline receives numerous requests for identification and control each summer.

Learn how to identify poison ivy, oak, and sumac plants and the rashes they cause. Although poison ivy isn't the only plant with leaves that grow in clusters of three, the adage "leaves of three, ...

A few years ago I was leading a group of Merrimack College ecology students on a nature walk, when one of them pointed to a vine with five leaflets per leaf, and asked if it was poison ivy. “No,” I ...