Mason Heberling, associate curator of botany at the Carnegie Museum of Natural History, holds a poison ivy specimen collected in Lehigh County, Pa. in 1840, the oldest used in the study. A new study ...

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 ...

If you were a Girl Scout or a Boy Scout, you probably heard the adage "leaves of three, let them be" to deter you from getting poison ivy rash. And, while it is true that a poison ivy leaf contains ...

Some people are not allergic to poison ivy. Some people are. I'm a person who spends a lot of time outdoors and, as luck would have it, I am very allergic to poison ivy. Who said that life is fair?

As East Texans take to decluttering their yard from fallen leaves, poison ivy, even brown and dormant, poses a risk of ...

Every gardener should know how to get rid of poison ivy when it pops up around the yard. If the sap from this plant comes in contact with your skin, a chemical called urushiol in the sap can cause ...

It is a great time of the year to be outside watching the leaves turn color a little bit each day even though the fall color season is late this year compared to recent years. Collecting those leaves ...

If you're allergic to Toxicodendron radicans, more commonly known as poison ivy, you might view wintertime as a welcome reprieve from this plant's itchy rash. Unfortunately, that's not quite the case.

I have to admit I have been remiss with respect to some topics. In most cases it was because I wrongly assumed some things were so widespread and common that any column of that type would simply be ...