Most gardeners have heard of the wise advice “leaves of three, let it be” referring to the pest plant poison ivy. While not quite as catchy, the saying really should be “leaflets of three, let it be.” ...

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 ...

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.

Poison ivy, Rhus radicans or Toxicodendron radicans, is an undeniable plant menace in home landscapes. I’m allergic to its plant oils, as you may be. It’s the plant we all love to hate. Purdue experts ...

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 ...

RICHMOND, Va. (WRIC) — Most of us have heard the old saying, likely from adults trying to protect us when we were young and inexperienced: “Leaves of three, let it be.” But is that truly an accurate ...

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 ...

Poison ivy often grows in cities and suburbs, not just forests. It appears in every U.S. state except Alaska and Hawaii. If you are not sure whether a plant is poison ivy, stay away anyway to keep ...