Poison ivy, oak and sumac all can create itchy rashes from urushiol. What you need to know before the rash starts.

The most commonly known poisonous plants are poison ivy, poison sumac and poison oak. English ivy is often overlooked and is used in landscaping as ground cover, but it can be just as dangerous for ...

When early gardeners first brought tree of heaven to the United States, the country itself was less than a decade old. In the ...