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Welcome to the World of Poison Ivy, Poison Oak, and Poison Sumac

There is a great deal of confusion about poison ivy vs. poison oak, since there are two kinds of poison ivy and two kinds of poison oak. Learn more.

We also have great products to keep you safe from all 5 of these nasty plants.

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The Blog

November 27, 2017

When the leaves fall, many trees, fences, and buildings are revealed to be covered with masses of poison ivy vines. See how this very aggressive vine covers not only the poor tree, but also layers of other poison ivy, all scrambling upward in a nasty competition.

November 15, 2017

A research paper has just been published about the difficult invasive weed, Japanese knotweed. Seems that in some kinds of forests, this weed is taking over the understory and preventing new tree saplings from growing, thus threatening the future of these forests. 

November 11, 2017

Up here in central New England, 2017 has had an extremely late first frost. (I wil forgo discussion of global warming to avoid the hate mail that such topics generate.) 

October 13, 2017

I knew without getting close that this red vine was NOT poison ivy. How did I know for sure?

Because I took this photo in Turn, Italy, and there is no poision ivy in Italy, nor anywhere in Europe, for that matter.